Готові списки джерел за темами / Additive manufacturing (FDM)

Добірка наукової літератури з теми "Additive manufacturing (FDM)"

Автор: Grafiati

Опубліковано: 15 червня 2024

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Статті в журналах з теми "Additive manufacturing (FDM)":

Beniak, Juraj, Peter Krizan, and Milos Matus. "CONDUCTIVE MATERIAL PROPERTIES FOR FDM ADDITIVE MANUFACTURING." MM Science Journal 2020, no. 1 (March 4, 2020): 3846–51. http://dx.doi.org/10.17973/mmsj.2020_03_2019135.

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Di Angelo, L., P. Di Stefano, and A. Marzola. "Surface quality prediction in FDM additive manufacturing." International Journal of Advanced Manufacturing Technology 93, no. 9-12 (July 24, 2017): 3655–62. http://dx.doi.org/10.1007/s00170-017-0763-6.

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Ch, Manoj,. "A REVIEW ON ADDITIVE MANUFACTURING (AM) MATERIAL - STATISTICS AND COMPARISIONS." INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, no. 05 (May 5, 2024): 1–5. http://dx.doi.org/10.55041/ijsrem32619.

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Fused deposition modeling, also known as FDM, boasts a major edge in the manufacturing industry for its remarkable capacity to craft intricate components sans pricey tooling or manual labor. As is the case with any engineering process, selecting the right process parameters plays a critical role in determining the quality of FDM products. Hence, precise calibration of these parameters is essential to elevate the durability and functionality of printed parts. Our study seeks to explore the influence of five crucial FDM parameters, including layer height and shell thickness, on the tensile strength of build parts, with the ultimate goal of optimizing overall product performance. Keywords:Fusion Deposition Modeling (FDM), Shell thickness, precise calibration, durability, functionality of printed parts.

Siraj, Imran, and Pushpendra S. Bharti. "Assessing quality in extrusion based additive manufacturing technologies." Journal of Information and Optimization Sciences 45, no. 1 (2024): 25–46. http://dx.doi.org/10.47974/jios-1137.

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Quality is a magic word that has fascinated the people since the early days of civilization and today, quality is the only mantra to survive. Quality is the only relevant attribute associated with product and processes that makes any technology in-demand. The quality of the parts produced by Additive Manufacturing (AM) Technologies depends on many factors, like print speed, nozzle temperature etc. The aim of this work is the identification of influence factors that affect the performance measures of extrusion based Additive Manufacturing (AM) technologies, namely, Fused Deposition Modelling (FDM). These processes can be characterized by a set of influence factors, like print speed, infill density, temperature; layer thickness and build orientation are responsible for quality of the product. In this work, Grey relational Analysis (GRA) is employed. GRA is a method which enables determination of the relational degree of every factor in the system. The method can be used for systems that are not completely described and with relatively few available data. Reliable technique of optimization GRA is clubbed with another established technique; called Interrelation ship Diagram (ID), to identify and optimize the influence factors, that yields highest performance characteristics. Manufacturing Combinations are evaluated against performance measures. In the earlier research, the authors have applied same tool, GRA clubbed with 7QC tools, to evaluate extrinsic and intrinsic qualities of the parts produced by FDM, In this research, the entire focus is paid to the intrinsic properties of the parts produced by FDM. This research will have a greater impact on the quality of the parts produced by the FDM.

Skawiński, Piotr, Przemysław Siemiński, and Piotr Błazucki. "Applications of additive manufacturing (FDM method) in the manufacturing of gear." Mechanik, no. 12 (December 2015): 976/173–976/179. http://dx.doi.org/10.17814/mechanik.2015.12.582.

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Boyard, Nicolas, Olivier Christmann, Mickaël Rivette, Olivier Kerbrat, and Simon Richir. "Support optimization for additive manufacturing: application to FDM." Rapid Prototyping Journal 24, no. 1 (January 2, 2018): 69–79. http://dx.doi.org/10.1108/rpj-04-2016-0055.

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Purpose This paper aims to present a new methodology to optimize the support generation within the fused deposition modeling process. Design/methodology/approach Different methods of support generation exist, but they are limited with regards to complex parts. This paper proposes a method dedicated to support generation, integrated into CAD software. The objective is to minimize the volume of support and its impact on a part’s surface finish. Two case studies illustrate the methodology. The support generation is based on an octree’s discretization of the part. Findings The method represents a first solid step in the support optimization for a reasonable calculation time. It has the advantage of being virtually automatic. The only tasks to be performed by the designer are to place the part to be studied with respect to the CAD reference and to give the ratio between the desired support volume and the maximum volume of support. Research limitations/implications In the case studies, a low gain in manufacturing time was observed. This is explained by the honeycomb structure of the support generated by a common slicing software, whereas the proposed method uses a “full” structure. It would be interesting to study the feasibility of an optimized support, with a honeycomb structure but with a preservation of the surface which is in contact with the part. Originality/value This solution best fits the needs of the designer and manufacturer already taking advantage of existing solutions. It is adaptable to any part if the withdrawal of support is taken into account. It also allows the designer to validate the generation of support throughout the CAD without breaking the digital chain.

Cuan-Urquizo, Enrique, Mario Martínez-Magallanes, Saúl E. Crespo-Sánchez, Alfonso Gómez-Espinosa, Oscar Olvera-Silva, and Armando Roman-Flores. "Additive manufacturing and mechanical properties of lattice-curved structures." Rapid Prototyping Journal 25, no. 5 (June 10, 2019): 895–903. http://dx.doi.org/10.1108/rpj-11-2018-0286.

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Purpose The purpose of this paper is to study the feasibility of the fabrication of circle arc curved-layered structures via conventional fused deposition modeling (FDM) with three-axis machines and to identify the main structural parameters that have an influence on their mechanical properties. Design/methodology/approach Customized G-codes were generated via a script developed in MATLAB. The G-codes contain nozzle trajectories with displacements in the three axes simultaneously. Using these, the samples were fabricated with different porosities, and their influence on the mechanical responses evaluated via tensile testing. The load-displacement curves were analyzed to understand the structure-property relationship. Findings Circled arc curved-layered structures were successfully fabricated with conventional three-axis FDM machines. The response of these curved lattice structures under tensile loads was mapped to three main stages and deformation mechanisms, namely, straightening, stretching and fracture. The micro-structure formed by the transverse filaments affect the first stage significantly and the other two minimally. The main parameters that affect the structural response were found to be the transverse filaments, as these could behave as hinges, allowing the slide/rotation of adjacent layers and making the structure more shear sensitive. Research limitations/implications This paper was restricted to arc-curved samples fabricated with conventional three-axis FDM machines. Originality/value The FDM fabrication of curved-structures with controlled porosity and their relation to the resulting mechanical properties is presented here for the first time. The study of curved-lattice structures is of great relevance in various areas, such as biomedical, architecture and aerospace.

Parandoush, Pedram, Palamandadige Fernando, Hao Zhang, Chang Ye, Junfeng Xiao, Meng Zhang, and Dong Lin. "A finishing process via ultrasonic drilling for additively manufactured carbon fiber composites." Rapid Prototyping Journal 27, no. 4 (May 5, 2021): 754–68. http://dx.doi.org/10.1108/rpj-10-2019-0260.

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Purpose Additively manufactured objects have layered structures, which means post processing is often required to achieve a desired surface finish. Furthermore, the additive nature of the process makes it less accurate than subtractive processes. Hence, additive manufacturing techniques could tremendously benefit from finishing processes to improve their geometric tolerance and surface finish. Design/methodology/approach Rotary ultrasonic machining (RUM) was chosen as a finishing operation for drilling additively manufactured carbon fiber reinforced polymer (CFRP) composites. Two distinct additive manufacturing methods of fused deposition modeling (FDM) and laser-assisted laminated object manufacturing (LA-LOM) were used to fabricate CFRP plates with continuous carbon fiber reinforcement. The influence of the feedrate, tool rotation speed and ultrasonic power of the RUM process parameters on the aforementioned quality characteristics revealed the feasibility of RUM process as a finishing operation for additive manufactured CFRP. Findings The quality of drilled holes in the CFRP plates fabricated via LA-LOM was supremely superior to the FDM counterparts with less pullout delamination, smoother surface and less burr formation. The strong interfacial bonding in LA-LOM proven to be superior to FDM was able to endure higher cutting force of the RUM process. The cutting force and cutting temperature overwhelmed the FDM parts and induced higher surface damage. Originality/value Overall, the present study demonstrates the feasibility of a hybrid additive and subtractive manufacturing method that could potentially reduce cost and waste of the CFRP production for industrial applications.

Chen, Jian-Ming, Demei Lee, Jheng-Wei Yang, Sheng-Han Lin, Yu-Ting Lin, and Shih-Jung Liu. "Solution Extrusion Additive Manufacturing of Biodegradable Polycaprolactone." Applied Sciences 10, no. 9 (May 3, 2020): 3189. http://dx.doi.org/10.3390/app10093189.

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Polycaprolactone (PCL) is a resorbable semicrystalline polymer that degrades slowly via hydrolysis and has applications in medical implants and drug delivery. As a result of its low melting point, PCL can be processed easily by conventional polymer processing techniques. However, the additive manufacturing of PCL remains a challenge, mainly due to the fact that there are no commercially available filaments for traditional fused deposition modeling (FDM). Furthermore, when the materials are fabricated via FDM for drug delivery applications, the high temperature may deactivate the incorporated drugs/biomolecules. This study investigates the solution extrusion additive manufacturing of PCL using a lab-developed solution-type device. The device comprises a solution extrusion feeder, driving stepper motors, a power source, a syringe equipped with a dispensing tip, an accumulation platform, and a control interface. The influences of different manufacturing parameters on part quality were evaluated. The experimental results suggest that the tensile strength of the additively manufactured parts increases with fill density but decreases with the ratio of PCL to dichloromethane (DCM) and moving speed of the dispensing tip. Parts fabricated by 90° print orientation of infill exhibited the greatest mechanical strength. The fabricated parts tend to heal the gaps among strips after additive manufacturing, but tiny pores can still be seen on the surfaces.

Hernandez-Contreras, Adriana, Leopoldo Ruiz-Huerta, Alberto Caballero-Ruiz, Verena Moock, and Hector R. Siller. "Extended CT Void Analysis in FDM Additive Manufacturing Components." Materials 13, no. 17 (August 30, 2020): 3831. http://dx.doi.org/10.3390/ma13173831.

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Additive manufacturing (AM) is the term for a number of processes for joining materials to build physical components from a digital 3D model. AM has multiple advantages over other construction techniques, such as freeform, customization, and waste reduction. However, AM components have been evaluated by destructive and non-destructive testing and have shown mechanical issues, such as reduced resistance, anisotropy and voids. The build direction affects the mechanical properties of the built part, including voids of different characteristics. The aim of this work is an extended analysis of void shape by means of X-ray computed tomography (CT) applied to fused deposition modeling (FDM) samples. Furthermore, a relation between the tensile mechanical properties and digital void measurements is established. The results of this work demonstrate that void characteristics such as quantity, size, sphericity and compactness show no obvious variations between the samples. However, the angle between the main void axis and the mechanical load axis α shows a relation for FDM components: when its mean value μ(α) is around 80 (degrees) the yield strength and Young’s modulus are reduced. These results lead to the formulation of a novel criterion that predicts the mechanical behavior of AM components.

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Дисертації з теми "Additive manufacturing (FDM)":

Rafaja, Hynek. "Monitorování procesu FDM tisku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-399310.

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The target of this work is the development of a monitoring system for 3D printing by the Fused Deposition Modeling method, which will be able to identify printing error conditions. During the solving process the needed error conditions were identified. Then, an algorithm was programmed to identify the error condition using the criterion. The resulting Monitoring Hardware was implemented in the printer and experimentally verified. A system has been developed that can identify error conditions with an accuracy of 94.7%. The main benefit of this work is the automatic identification of error conditions that stop printing if necessary. This leads to a reduction in scrap and cost savings. In the future, the software could automatically adjust the print parameters when identifying an error condition. This would prevent or completely eliminate the error condition without user intervention.

Ravi, Prame Manush. "Fracture Properties of Thermoplastic Composites Manufactured Using Additive Manufacturing." Youngstown State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1516191324564382.

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Emericks, Isak. "Challanges In Constructing Large Frame FDM 3D Printers." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279503.

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This project was initiated by Postnord who wanted to develop their own large frame FDM 3D printer, mainly for two reasons. The first reason was to be able to use the collaboration between Postnord and KTH to present how Postnord are promoting domestic production in the same time as portraying themselves as leaders in the field of additive manufacturing in Sweden. The second reason was to get a machine with the ability to print both small- and large-scale prototypes and products to be used in an industrial environment. The targeted goals and desired outcome of the PP3D (PostPaper3D - project name) was to construct a large frame FDM 3D printer, with a build area of 1 square meter and (if possible) a printing volume of 1 cubic meter, capable of printing parts for industrial applications. This would be achieved by using industrial components and state-of-the-art open source 3D printing control systems. Sensors for filament run-out detection and automatic printer bed levelling was also desired. On top of these goals KTH-IIP wanted the project work to focus on the construction of large frame FDM 3D printers, what challenges appear in scaling up the technology, to further the internal vision of developing strategic competencies in the field of additive manufacturing - as requested by the industry. The result of the project was a FDM 3D printer with a build volume of 1000x1000x950 [mm] that comes with dual independent extruders - meaning it may either print two copies of the same part simultaneously or utilize both printer heads to work on a single component. The top tested speed (printing) was 100 [mm/s] and the top tested movement speed was 250 [mm/s]. The theoretical accuracy of the machine is 50 [μm] but this has not been tested in this project. In the scope of the master thesis all prototype-symptoms were not eliminated, where the most considerable issue being the motors occasionally skipping steps (and losing their location) during rapid accelerations and changes in velocity. When this happens, it will most likely result in a failed print. The proposed solution for this is to further adjust the firmware to allow for finer, more regulated accelerations and speeds. Another possible solution is to replace the motors with stronger ones. In delivery the machine operates using state of the art components and software, from prominent Swedish and international producers. An interview of Isak Emericks alongside the printer can be seen in Appendix B, in the form of a newsletter.
Det här projektet initierades av Postnord som ville utveckla en egen storskalig FDM 3D printer, huvudsakligen på grund av två anledningar. Den första för att kunna använda samarbetet med KTH för att visa hur Postnord främjar inhemsk produktion samtidigt som de själva är ledare och initiativtagare inom additiv tillverkning i Sverige. Den andra anledningen var för att få tag på en maskin som har möjligheten att skriva ut stora- och småskaliga prototyper och produkter som kan användas i en industriell miljö. De uppsatta målen och önskvärda resultatet med PP3D (PostPapper3D - projektnamn) var att konstruera en storskalig FDM 3D skrivare, men en byggarea på 1 kvadratmeter och (om möjligt) en byggvolym på 1 kubikmeter, kapabel att skriva ut delar för industriella tillämpningar. Det här skulle uppnås genom att använda industriella komponenter och toppmoderna kontrollsystem för 3D skrivare. Sensorer för att upptäcka när utskriftsmaterialet var på väg att ta slut och automatisk utjämning av byggytan var också önskvärt. Förutom dessa målsättningar så ville KTH-IIP att arbetet skulle fokusera på konstruktionen av en storskalig FDM 3D skrivare, vilka utmaningar och problem som uppstår när tekniken skalas upp, för att fortsätta den interna visionen om att utveckla strategiska kompetenser inom additiva tillverkningsmetoder - vilket industrin efterfrågade. Resultatet av projektet var en 3D skrivare med en byggvolym på 1000x1000x950 [mm] som kommer utrustad med två (individuellt styrda) utskriftshuvuden - som antingen kan skriva ut två identiska kopior av samma objekt eller som kan arbeta tillsammans för att bygga upp en komponent mer effektivt. Den högsta testade utskriftshastigheten var 100 [mm/s] och den högsta testade hastigheten för rörelse var 250 [mm/s]. Den teoretiska upplösningen hos maskinen är 50 [μm] men det här har inte kontrollerats i det här projektet. Inom omfattningen av ett examensarbete (civilingenjör) så hann inte alla prototyp-symptom elimineras, där det mest betydande problemet var att motorerna bitvis missar steg (och förlorar sin positionering) under hastiga accelerationer och förändringar i rörelseriktning. När detta händer så resulterar det oftast i misslyckade utskrifter. Den presenterade lösningen för det här är att fortsätta justera mjukvaruinställningarna tills finare och mer kontrollerade rörelsemönster uppnås. En annan tänkbar lösning är att byta ut motorerna mot starkare varianter. Vid leverans så nyttjar maskinen toppmoderna komponenter och mjukvara, från framstående svenska och internationella producenter. En intervju med Isak Emericks tillsammans med 3D skrivaren hittas i Bilaga B, i formen av ett nyhetsbrev.

Kota, Vasuman. "Rasters vs Contours For Thin Wall ULTEM 9085 FDM Applications." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1567029612963881.

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Sauter, Barrett. "Ultra-light weight design through additive manufacturing." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-45160.

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ABB Corporate Research was looking to redevelop one product to be manufactured via polymer additive manufacturing (AM), as opposed to its previously traditionally manufacturing method. The current product is cylindrical in shape and must withstand a certain amount of hydrostatic pressure. Due to the pressure and the current design, the cannister is prone to buckling failure. The cannister is currently produced from two cylindrical tube parts and two spherical end sections produced from solid blocks of the same material. For assembly, an inner assembly is inserted into one of the tube parts and then all parts are welded together. This product is also custom dimensioned for each purchase order. The purpose of investigating this redevelopment for AM is to analyse if an updated inner design unique to additive manufacturing is able to increase the performance of the product by increasing the pressure it can withstand from both a material failure standpoint and a buckling failure. The redevelopment also aims to see if the component count and process count can be decreased. Ultimately, two product solutions are suggested, one for low pressure ranges constructed in ABS and one for high pressure ranges constructed in Ultem 1010. To accomplish this, relevant literature was referred to gain insight into how to reinforce cylindrical shell structures against buckling. Design aspects unique to AM were also explored. Iterations of these two areas were designed and analysed, which led to a final design choice being decided upon. The final design is ultimately based on the theory of strengthening cylindrical structures against buckling through the use of ring stiffeners while also incorporating AM unique design aspects in the form of hollow network structures. By utilizing finite element analysis, the design was further developed until it held the pressure required. Simulation results suggest that the ABS product can withstand 3 times higher pressure than the original design while being protected against failure due to buckling. The Ultem simulation results suggest that the product can withstand 12 times higher pressure than the current design while also being protected against failure due to buckling. Part count and manufacturing processes are also found to have decreased by half. Post-processing treatments were also explored, such as the performance of sealants under pressure and the effects of sealants on material mechanical properties. Results show that one sealant in particular, an acrylic spray, is most suitable to sealing the ABS product. It withstood a pressure of 8 bar during tests. The flexural tests showed that the sealant did indeed increase certain mechanical properties, the yield strength, however did not affect the flexural modulus significantly. This work gives a clear indication that the performance of this product is feasibly increased significantly from redeveloping it specifically to AM.

Ferri, Martina. "Studio di nanocompositi di TPU/grafene per additive manufacturing." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24385/.

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La Fused Deposition Modeling (FDM) è una tecnologia di Additive Manufacturing (3D printing) adatta alla lavorazione di polimeri termoplastici e ampiamente utilizzata per la fabbricazione di oggetti con geometrie complesse. Attualmente, i principali limiti di questa tecnologia risiedono nella scarsa qualità e nelle basse proprietà meccaniche dei manufatti, se comparate a quelle di oggetti creati con tecnologie convenzionali. Questi svantaggi hanno portato ricercatori accademici e industriali a studiare nuovi materiali da processare mediante FDM che avessero performance migliori. Una delle soluzioni proposte è stata lo sviluppo di materiali compositi. Il lavoro presentato si colloca in questo contesto e si inserisce all’interno di un progetto di ricerca volto alla sintesi di nanocompositi a base di TPU rinforzato con grafene processabili tramite FDM. I nanocompositi sono stati preparati utilizzando un poliuretano termoplastico commerciale (Elastollan® C 60 A HPM (BASF)) e diverse concentrazioni di grafene commerciale (250, 1000 e 10000 ppm). La formulazione dei materiali è stata effettuata mediante solution blending. I nanocompositi ottenuti sono stati pellettizzati, estrusi per ottenere i filamenti di alimentazione per la stampante 3D ed infine stampati. Pellet, filamenti e stampati sono stati caratterizzati mediante analisi termica e comparati tra loro. I nanocompositi stampati 3D sono stati caratterizzati anche dal punto di vista meccanico (misura del coefficiente di espansione termica, analisi dinamico-meccanica e prove di trazione) ed è stata misurata la capacità termica (CP). Infine, la morfologia dei nanocompositi stampati ottenuti è stata osservata dopo frattura criogenica attraverso microscopio elettronico a scansione (SEM) e microscopia ottica digitale.

Ahmadifar, Mohammad. "Etude de la rhéologie des composites polymères au cours du procédé FDM (Fabrication additive)." Thesis, Paris, HESAM, 2021. http://www.theses.fr/2021HESAE072.

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Additive manufacturing (AM) is a novel technology that enables rapid fabrication of physical models directly from 3D computer-aided design (CAD) data without any conventional tooling or programming requirement. Thermoplastic polymers are the most useful materials for the manufacturing of parts in the FFF process. In this process, extrusion of a semi-molten road through a nozzle is taken place to form each layer, the extruded road solidifies quickly due to the existence of temperature gradient between the surroundings and the extrusion temperature. Different key parameters affect the final products manufactured by this process. These parameters can be listed in three categories. Some of them are linked to the material, others are linked either to the characteristics of the process or to the specificity of the machine. They can influence the properties of the final part through their effect on various physical phenomena. The mentioned parameters affect the polymer temperature and its evolution. It is important to know the evolution of filaments temperature with time and recognize how it is affected by major process variables as mentioned. Due to the nature of the FFF process, it is important to measure the temperature profile and its evolution during the process by the means of local measurement methods. The idea of this work took place in 2018, by start reviewing literatures related to the FFF process. As mentioned, almost all studies and works either numerical or experimental approaches were based on global consideration. In the beginning, the work was concentrated on finding a method to be applied to the FFF process to proceed with the localized investigation. Afterward, the experiment was started to see the possibility of the work. As in the FFF process, there is a deposition of filaments, and each filament itself is heated by the deposition of newer filaments, there is almost a cyclic evolution of the temperature due to multi-layer d eposition and it means that each filament is re-heated consequently because of the deposition of a new filament. This is a critical issue in creating a filament bonding and diffusion of materials. To implement and measure this cyclic temperature, it is required to apply a measurement device in which to be capable of measuring the temperature of the polymer when leaving the nozzle. One can note that the mechanical properties of 3d-printed pieces are limited. In this work, we try to improve the mechanical properties by reinforcing the fibers such as glass fibers, carbon fibers, etc. At the same time by controlling the temperature evolution, we try to improve the adhesion between the layers to have the best structure. The used material as raw material was polyamide-6 (PA6). The main objective of this research is to study the rheological characteristics of materials during FDM/FFF to process optimization for mechanical characterization improvement of the fabricated parts. Therefore, the main objective is to take into account both the temperature and viscosity parameters, and to establish the Time-Temperature-Transformation diagram for process optimization. This helps to determine the processability area
Additive manufacturing (AM) is a novel technology that enables rapid fabrication of physical models directly from 3D computer-aided design (CAD) data without any conventional tooling or programming requirement. Thermoplastic polymers are the most useful materials for the manufacturing of parts in the FFF process. In this process, extrusion of a semi-molten road through a nozzle is taken place to form each layer, the extruded road solidifies quickly due to the existence of temperature gradient between the surroundings and the extrusion temperature. Different key parameters affect the final products manufactured by this process. These parameters can be listed in three categories. Some of them are linked to the material, others are linked either to the characteristics of the process or to the specificity of the machine. They can influence the properties of the final part through their effect on various physical phenomena. The mentioned parameters affect the polymer temperature and its evolution. It is important to know the evolution of filaments temperature with time and recognize how it is affected by major process variables as mentioned. Due to the nature of the FFF process, it is important to measure the temperature profile and its evolution during the process by the means of local measurement methods. The idea of this work took place in 2018, by start reviewing literatures related to the FFF process. As mentioned, almost all studies and works either numerical or experimental approaches were based on global consideration. In the beginning, the work was concentrated on finding a method to be applied to the FFF process to proceed with the localized investigation. Afterward, the experiment was started to see the possibility of the work. As in the FFF process, there is a deposition of filaments, and each filament itself is heated by the deposition of newer filaments, there is almost a cyclic evolution of the temperature due to multi-layer d eposition and it means that each filament is re-heated consequently because of the deposition of a new filament. This is a critical issue in creating a filament bonding and diffusion of materials. To implement and measure this cyclic temperature, it is required to apply a measurement device in which to be capable of measuring the temperature of the polymer when leaving the nozzle. One can note that the mechanical properties of 3d-printed pieces are limited. In this work, we try to improve the mechanical properties by reinforcing the fibers such as glass fibers, carbon fibers, etc. At the same time by controlling the temperature evolution, we try to improve the adhesion between the layers to have the best structure. The used material as raw material was polyamide-6 (PA6). The main objective of this research is to study the rheological characteristics of materials during FDM/FFF to process optimization for mechanical characterization improvement of the fabricated parts. Therefore, the main objective is to take into account both the temperature and viscosity parameters, and to establish the Time-Temperature-Transformation diagram for process optimization. This helps to determine the processability area

Capriotti, Marco. "Utilizzo di scarti agroalimentari nella produzione di biocompositi per additive manufacturing." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25767/.

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Nell’ambito delle materie plastiche, la necessità di trovare delle soluzioni al consumo di materie prime non rinnovabili per la loro produzione, attualmente dipendente dal petrolio, ha portato la ricerca allo sviluppo dei biopolimeri, tra cui il PHB, PHA, PCL, PVA e PLA, grazie alla loro biodegradabilità e compostabilità. Tra i biopolimeri presenti in commercio, il PLA è ritenuto essere il più interessante, in quanto possiede buone proprietà meccaniche e facilità di lavorazione. Attualmente l’utilizzo del PLA, rispetto alle commodities termoplastiche, presenta dei limiti legati al suo elevato costo. Nel seguente elaborato di tesi è stata posta l’attenzione sull’utilizzo di due scarti dell’industria agroalimentare quali il farinaccio di grano e la lolla del riso. Nel tentativo di valorizzare questi scarti sono stati realizzati dei biocompositi a matrice PLA al 10% e al 20% per ogni biofiller, da utilizzare nella lavorazione mediante stampa 3D. L’obbiettivo principale è quello di ridurre il contenuto di polimero nel filamento per stampa 3D, ottenendo quindi materiali eco-sostenibili possibilmente di minor costo mantenendo quanto più possibile intatte le proprietà meccaniche dei materiali stampati. I biocompositi prodotti tramite stampa 3D, sono stati sottoposti a caratterizzazione termica mediante analisi TGA e DSC volte a determinare le loro principali proprietà termiche. Inoltre mediante lo strumento DMA è stato possibile studiare il comportamento viscoelastico dei diversi formulati e determinarne il coefficiente di espansione termico lineare CLTE. Infine, mediante prove di trazione al dinamometro è stato studiato il comportamento a rottura dei materiali valutandolo su provini stampati in tre direzioni X,Y, Z rispetto all’asse di trazione e perpendicolari tra loro.

Bernardi, Alberto. "Controllo di un dispositivo di alimentazione filo per una stampante FDM." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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L’attività descritta in questo elaborato è relativa alla fase di sviluppo di un prototipo per un sistema di caricamento automatico di filamento per stampanti 3D progettate da Mark One, azienda specializzata in additive manufacturing. In primo luogo, è stata effettuata un’analisi funzionale del problema, analizzando le specifiche tecniche richieste dall’ufficio tecnico. Si è poi proseguito con uno studio delle varie proposte, approfondendo quelle ritenute più vantaggiose e studiando i punti di forza e criticità di ognuna. Una volta individuata la scelta più vantaggiosa, è stato realizzato il file CAD dell’elemento, scelta la componentistica e stampato il primo prototipo degli elementi. Questo elaborato è la parte conclusiva del progetto e prevede l’implementazione delle componenti elettroniche, come del motore passo passo, sensori per la rilevazione del filamento e la creazione del codice per il microcontrollore.

Guglieri, Alessandro. "Design ed ottimizzazione strutturale di un APR realizzato con tecnologie additive." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23557/.

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L'elaborato, di tipo sperimentale, nasce da un progetto svolto durante il Laboratorio di costruzioni aeronautiche e consiste nella progettazione di un telaio di APR (Aeromobile a Pilotaggio Remoto) per riprese in volo, destinato alla produzione tramite stampa 3D. Nella prima versione del progetto si erano resi evidenti molti difetti nel design della struttura; in vista dei possibili miglioramenti applicabili al telaio, ho deciso di cambiarne completamente la configurazione e le dimensioni, al fine di progettare un frame con la minor massa possibile per migliorare le prestazioni dell'aeromobile. Sono stati prodotti due telai seguendo metodologie differenti. La prima consiste in una progettazione di tipo convenzionale del telaio tramite software CAD (Computer Aided Design, ossia disegno tecnico assistito dall'elaboratore). Il secondo metodo è costituito dall'utilizzo di un software che permette l'ottimizzazione topologica del componente: partendo dallo spazio di progetto, è possibile ricavare in modo semi automatico una geometria ottimizzata per resistere ai carichi assegnati. Gli elementi del telaio sono stati pensati per essere prodotti tramite stampa 3D in materiale polimerico per valutarne successivamente le prestazioni e paragonarli in termini di massa.

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Книги з теми "Additive manufacturing (FDM)":

Singh, Rupinder, and J. Paulo Davim. Additive Manufacturing. Taylor & Francis Group, 2021.

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Singh, Rupinder, and J. Paulo Davim. Additive Manufacturing: Applications and Innovations. Taylor & Francis Group, 2018.

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Singh, Rupinder, and J. Paulo Davim. Additive Manufacturing: Applications and Innovations. Taylor & Francis Group, 2018.

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Singh, Rupinder, and J. Paulo Davim. Additive Manufacturing: Applications and Innovations. Taylor & Francis Group, 2018.

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Частини книг з теми "Additive manufacturing (FDM)":

Henry, Silke, Valérie Vanhoorne, and Chris Vervaet. "Fused Deposition Modeling (FDM) of Pharmaceuticals." In Additive Manufacturing in Pharmaceuticals, 45–96. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2404-2_2.

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Boualaoui, Abderrazak, Driss Sarsri, and Mohammed Lamrhari. "Topological Optimization for Fused Deposition Modeling (FDM) Process." In Springer Tracts in Additive Manufacturing, 127–36. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-32927-2_12.

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Sandhu, Gurleen Singh, and Rupinder Singh. "Development of ABS-Graphene Blended Feedstock Filament for FDM Process." In Additive Manufacturing of Emerging Materials, 279–97. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-91713-9_9.

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Çolak, Oğuz, and Anar Abbasov. "Experimental Investigation of Recycled Pet Materials Fdm Process Parameters Using Taguchi Analysis." In Springer Tracts in Additive Manufacturing, 3–10. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-32927-2_1.

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Taufik, Mohammad, and Prashant K. Jain. "Development and Analysis of Accurate and Adaptive FDM Post-finishing Approach." In 3D Printing and Additive Manufacturing Technologies, 59–71. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0305-0_6.

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Saxena, Piyush, and R. M. Metkar. "Development of Electrical Discharge Machining (EDM) Electrode Using Fused Deposition Modeling (FDM)." In 3D Printing and Additive Manufacturing Technologies, 257–68. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0305-0_22.

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Azzouzi, Adil El, Hamid Zaghar, Mohammed Sallaou, and Larbi Lasri. "Effects of Build Orientation and Raster Angle on Surface Roughness and Mechanical Strength of FDM Printed ABS." In Springer Tracts in Additive Manufacturing, 51–60. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-32927-2_5.

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Sbriglia, Lexey R., Andrew M. Baker, James M. Thompson, Robert V. Morgan, Adam J. Wachtor, and John D. Bernardin. "Embedding Sensors in FDM Plastic Parts During Additive Manufacturing." In Topics in Modal Analysis & Testing, Volume 10, 205–14. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30249-2_17.

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Liu, Yizhuo, and Hao Hua. "Translucent Tectonics: Lightweight Floor Slab System Based on FDM Manufacturing." In Computational Design and Robotic Fabrication, 503–14. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8405-3_42.

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AbstractA construction method for an FDM printed floor slab system is proposed in this paper. The integration of translucent thermoplastics and additive manufacturing enables architects to develop self-explanatory tectonics that reflect the logic and construction processes. Lightweight, transparent thermoplastics such as PET and PLA can be used in 3D printing to create visual contrast to conventional solid materials. The additive manufacturing process can improve structural behavior by controlling the material distribution. Therefore, the proposed floor slab system pursues ‘light and strong’ via using a carefully planned toolpath for FDM printing. An entire floor is subdivided into prefabricated modular components, which are then assembled using the post-tensioning method to improve the integrity and tensile strength of the floor system. A toolpath is designed based on the internal stress of the components such that the material density reflects the structural behavior of the floor slab. The material efficiency is thereby achieved by the optimized articulation. In addition, we maximize the continuity of the printing path to enhance the printing quality and reduce the manufacturing time. This construction method is applied to the renovation of a group of industrial buildings. Prototyping experiments were carried out using translucent PLA to visualize the material distribution inside modules, manifesting the design principle of “form follows performance”.

Mukhopadhyay, Premangshu, and Bipradas Bairagi. "A New Non Linear Fuzzy Approach (NLFA) for Performance Evaluation of FDM Based 3D Printing Materials." In Additive Manufacturing in Multidisciplinary Cooperation and Production, 157–70. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-37671-9_14.

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Тези доповідей конференцій з теми "Additive manufacturing (FDM)":

Patterson, Albert E., Seymur Hasanov, and Bhaskar Vajipeyajula. "Influence of Matrix Material on Impact Properties of Chopped Carbon Fiber-Thermoplastic Composites Made Using FDM/FFF." In 2022 International Additive Manufacturing Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/iam2022-88941.

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Abstract A major applications of thermoplastic additive manufacturing (typically completed using the fused deposition modeling or fused filament fabrication (FDM/FFF) process) is in the production of polymer matrix composites. Several different reinforcing materials have been proposed and studied, a common one of which is chopped carbon fibers (CCF). Most of the published research on the properties and effect of the CCF reinforcement has relied upon a poly(lactic acid) (PLA) matrix, as it has a low and stable melting temperature, low cost, and mixes readily with particulate or chopped reinforcing materials. For commercially available CCF filament for FDM/FFF, the typical fiber content is around 15–25% by volume, with the remainder being the thermoplastic matrix. To better explore the influence of the matrix material on the properties of these materials, this study compares the IZOD impact properties of standard CCF PLA with CCF-reinforced materials using polyamide/nylon (PA), polycarbonate (PC), acrylonitrile butadiene styrene (ABS), and polyethylene terephthalate glycol (PETG) matrices. All cases were printed at full (100%) density. For each material, samples of 5 mm thickness were tested in the Type A (notch in tension) and Type E (notch in compression) configurations. Two print orientations (flat and horizontal) and two raster angles (0–90° and ±45°) were considered for each combination. As required by ASTM D256, the tests were replicated five times each. The results are compared with the major literature for CCF reinforced PLA, as well as benchmark tests using injection molded samples and non-CCF PLA, PA, PC, ABS, and PETG processed by FDM/FFF.

Singh, Hargurdeep, Farzad Rayegani, and Godfrey Onwubolu. "Cost Optimization of FDM Additive Manufactured Parts." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36697.

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This paper describes the experiments carried out on fused deposition modelling (FDM) machine to investigate the effects of process parameters on the cost of producing suspension arm and articulated rod. The process parameters considered include build orientation, raster width, and air gap. Using the cost estimation procedure described in this paper, the best option for part orientation, raster width, and air gap is realized which impact on the cost of manufacturing the part. Consequently, before committing to run the FDM machine, users can anticipate process parameters that will minimize manufacturing cost. However, in some cases, other objectives need be considered such as functionality since the configuration that leads to minimum cost may not necessarily result in optimum functionality.

Wu, Dazhong, Yupeng Wei, and Janis Terpenny. "Surface Roughness Prediction in Additive Manufacturing Using Machine Learning." In ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6501.

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To realize high quality, additively manufactured parts, real-time process monitoring and advanced predictive modeling tools are crucial for accelerating quality assurance and quality control in additive manufacturing. While previous research has demonstrated the effectiveness of physics- and model-based diagnosis and prognosis for additive manufacturing, very little research has been reported on real-time monitoring and prediction of surface roughness in fused deposition modeling (FDM). This paper presents a new data-driven approach to surface roughness prediction in FDM. A real-time monitoring system is developed to monitor the health condition of a 3D printer and FDM processes using multiple sensors. A predictive model is built by random forests (RFs). Experimental results have shown that the predictive model is capable of predicting the surface roughness of a printed part with very high accuracy.

Rayegani, Farzad, Godfrey C. Onwubolu, Attila Nagy, and Hargurdeep Singh. "Functional Prototyping and Tooling of FDM Additive Manufactured Parts." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37828.

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In this paper, we present two additive manufacturing applications: (1) vacuum forming tooling using AM; (2) rocket functional prototype using AM for computational fluid dynamics (CFD) and wind-tunnel testing. The first application shows how additive manufacturing (AM) facilitates the manufacture of vacuum formed parts, which allows such parts to be easily produced especially in the manufacturing sector. We show how combining the advantages of the CAD and FDM technology, vacuum forming can be completed quickly, efficiently and cost effectively. The paper shows that using modified build parameters, the tools FDM creates can be inherently porous, which eliminates the time needed for drilling vent holes that are necessary for other vacuum forming tools, while improving part quality with an evenly distributed vacuum draw. Using SolidWorks CAD software, the model of the tool is created. The STL file is exported to the Insight software, and we present how the Tool Paths Custom Group feature is applied to optimize the tool-paths file and then sent to the FDM system that prints the tooling from ABS engineering thermoplastic. The tooling is then used in the Formech 686 manual vacuum forming machine to produce the vacuum formed part. The second application shows how additive manufacturing (AM) has been applied to producing functional model for wind–tunnel testing, as well as providing computational fluid dynamics (CFD) tool for comparing results obtained from the wind-tunnel testing. The present work is focused on applications of FDM technology for manufacturing wind tunnel test models. The CAD model of a rocket was analyzed for its aerodynamic properties and its functional prototype produced using AM for use in wind–tunnel testing so as to verify and tune the aerodynamic properties. Initial wall conditions were defined for the rocket in terms of the air velocity. The flow simulation was carried out and the goals examined are the velocity and pressure fields around the rocket model. The paper examines some practical issues that arise between how the model geometry for CDF process differs from that that of the FDM process. Consequently, we show that AM-based fused deposition modeling (FDM) technology is faster, less expensive and more efficient than traditional manufacturing processes for vacuum forming and for rapid prototyping of function models for wind-tunnel applications.

Ning, Fuda, Weilong Cong, Zhenyuan Jia, Fuji Wang, and Meng Zhang. "Additive Manufacturing of CFRP Composites Using Fused Deposition Modeling: Effects of Process Parameters." In ASME 2016 11th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/msec2016-8561.

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Fused deposition modeling (FDM) is one of the attractive additive manufacturing (AM) technologies for rapid prototyping with complex structures in a short timeframe. Thermoplastics are currently used as common feedstocks to fabricate prototypes in FDM process. However, FDM-fabricated pure thermoplastic parts cannot be used as load-bearing parts in the actual applications due to their limited tensile strength. Such condition could be improved by developing carbon fiber reinforced plastic (CFRP) composites using FDM for potential industrial end users. It is crucial that proper selections of FDM process parameters during fabricating CFRP composite parts could ensure the part quality and properties. However, the effects of FDM process parameters on the tensile properties of CFRP composites have not been explored. In this paper, CFRP composite specimens with 5 wt% carbon fiber content were fabricated using a FDM machine. Tensile testing was conducted to obtain the tensile properties. The effects of process parameters (including infill speed, nozzle temperature, and layer thickness) on the tensile properties of FDM-fabricated CFRP composite parts were investigated.

Riemenschneider, Johannes, Rytis Mitkus, and Srinivas Vasista. "Integration of Actuators by Additive Layer Manufacturing." In ASME 2017 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/smasis2017-3764.

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Additive Layer Manufacturing is offering tremendous oportunities for manufacturing. Many complex structures, which could not be manufactured by conventional methods can be produced additive. This paper gives three examples of how additive manufacturing can be used to built smart structures with integrated actuators and sensors. The integration of piezoceramic actuators into FDM and SLM processes is described as well as the design of structures with integrated pneumatic actuators printed with the PolyJet method.

Guo, Liang, Yunxi Cheng, Yu Zhang, Yingfu Liu, Changcheng Wan, and Jing Liang. "Development of Cloud-Edge Collaborative Digital Twin System for FDM Additive Manufacturing." In 2021 IEEE 19th International Conference on Industrial Informatics (INDIN). IEEE, 2021. http://dx.doi.org/10.1109/indin45523.2021.9557492.

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Silva, Ricardo Júnior de Oliveira, Natália Pereira de Azevedo, and Fabiano Oscar Drozda. "Dimensional Precision of Abs Parts Manufactured By Additive Manufacturing in FDM Technology." In The 8th World Congress on Mechanical, Chemical, and Material Engineering. Avestia Publishing, 2022. http://dx.doi.org/10.11159/icmie22.101.

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Chee, Zhen Qi, Zi Jie Choong, and Wai Leong Eugene Wong. "Digitization of Fused Deposited Methods (FDM) Printer for Smart Additive Manufacturing (AM)." In 2021 24th International Conference on Mechatronics Technology (ICMT). IEEE, 2021. http://dx.doi.org/10.1109/icmt53429.2021.9687227.

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Chen, Roland K., Terris T. Lo, Lei Chen, and Albert J. Shih. "Nano-CT Characterization of Structural Voids and Air Bubbles in Fused Deposition Modeling for Additive Manufacturing." In ASME 2015 International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/msec2015-9462.

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The build quality of fused deposition modeling (FDM) parts depends on many build parameters, such as toolpath and temperature. Destructive material testing methods are widely used to examine FDM parts with different build parameters. The optimization of build parameters relies on methods of experimental design and extensive material testing. However, this approach mainly considers the bulk properties of the FDM part, without fully understanding the effect of each parameter on the build quality. This study presents a method to investigate the integrity of FDM parts using nano-focus computed tomography (NanoCT). A solid filled ULTEM sample was built and underwent NanoCT scan. The three dimensional geometry of this sample was reconstructed. Structural voids and bubbles inside the sample were also identified and quantified. The volume of this solid filled sample consists of 11.9% structural voids and bubbles. Air bubbles are further categorized into internal bubbles (bubbles inside the deposited fibers) and necking bubbles (bubbles at the bonding region of two adjacent fibers). While structural voids can be predicted according to toolpath, layer thickness, and extruder diameter, the occurrence of air bubbles are unexpected and can compromise the integrity of the built parts. NanoCT offers a non-destructive way to inspect the integrity of FDM parts. NanoCT can also be used to study three dimensional meso-structure and correlate that with build parameters. This will provide insightful information for further studying the FDM process and help to predict material strengths and to improve the part quality.