A Pellet 3D Printer: Device Design and Process Parameters Optimization

Liu, Shiyi; Zhao, Peng; Wu, Senyang; Zhang, Chengqian; Fu, Jianzhong; Chen, Zichen

doi:10.1155/2019/5075327

Cited by 12 publications

(7 citation statements)

References 35 publications

(35 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the latter, the process is assisted by a heated hopper/screw or syringe connected to a nozzle 19‐22 . While FDM from pellets is much cheaper and there is a wide variety of commercial materials, it is more difficult to control the extrusion flow and thus the surface and bulk quality of the printed objects 23 …”

Section: Introductionmentioning

confidence: 99%

Novel three‐dimensional printing of poly(ester urethane) scaffolds for biomedical applications

Lores

Hung

Talou

et al. 2021

Polymers for Advanced Techs

View full text Add to dashboard Cite

Tissue engineering requires highly porous complex structures with interconnected pores and tightly controlled pore sizes, added to customized production. Additive manufacturing (AM) is nowadays one of the most suitable technologies for the preparation of structures with strictly defined complex three‐dimensional architectures. Moreover, computed tomography and magnetic resonance imaging can be employed to obtain personalized medical devices. Fused deposition modeling (FDM) is one of the most common, easiest, and cost‐effective AM techniques to obtain 3D objects from a wide variety of materials. However, there is a lack of bioresorbable materials that can fit the increasing demand for biomedical applications requiring stiff elastomers. In this work, a series of bioresorbable segmented poly(ester urethanes) (SPEU) with high hard segment content was synthesized and physicochemically characterized. The materials with higher thermal stability were processed into homogeneous filaments by hot‐melt extrusion with no need for additives nor plasticizers. These filaments were evaluated for FDM, and structures with controlled porosity, filament diameter, and in‐plane pore size could be easily obtained by modifying the printing parameters. Regarding SPEU mechanical properties, the obtained scaffolds could be promising for cartilage tissue engineering applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Novel three‐dimensional printing of poly(ester urethane) scaffolds for biomedical applications

Lores

Hung

Talou

et al. 2021

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

“…This issue is particularly relevant in some research areas where multi-material printing from already printed features (recycled material). Compared with filaments, plastic pellets have a lower cost and straightforward production process [ 42 , 43 ]. Besides, a few additional limitations are related to using new materials in FFF printers, such as the specific size and properties required for the filament.…”

Section: Materials Extrusionmentioning

confidence: 99%

“…Similarly, Volpato et al [ 45 ] proposed a piston-driven extrusion system using polypropylene to produce a continuous, however defective, extrusion process. Later, on a large scale, Liu et al [ 42 ] introduced the concept of Fused Pellet Modeling (FPM), which combines the layer-by-layer construction systems of conventional 3D printing with screw-based extrusion systems adapted from injection molding tools to additive processes. These adaptations made it possible to increase the nozzle size and layer height and reduce printed parts’ costs due to the lower cost of polymer pellets.…”

Section: Materials Extrusionmentioning

confidence: 99%

Innovation in Additive Manufacturing Using Polymers: A Survey on the Technological and Material Developments

et al. 2022

View full text Add to dashboard Cite

This review summarizes the most recent advances from technological and physico-chemical perspectives to improve several remaining issues in polymeric materials’ additive manufacturing (AM). Without a doubt, AM is experimenting with significant progress due to technological innovations that are currently advancing. In this context, the state-of-the-art considers both research areas as working separately and contributing to developing the different AM technologies. First, AM techniques’ advantages and current limitations are analyzed and discussed. A detailed overview of the efforts made to improve the two most extensively employed techniques, i.e., material extrusion and VAT-photopolymerization, is presented. Aspects such as the part size, the possibility of producing parts in a continuous process, the improvement of the fabrication time, the reduction of the use of supports, and the fabrication of components using more than one material are analyzed. The last part of this review complements these technological advances with a general overview of the innovations made from a material perspective. The use of reinforced polymers, the preparation of adapted high-temperature materials, or even the fabrication of metallic and ceramic parts using polymers as supports are considered. Finally, the use of smart materials that enable the fabrication of shape-changing 3D objects and sustainable materials will also be explored.

show abstract

“…Instead of direct drive or Bowden-type extruder based printers for filament based FDM technology, single-screw extruders have been developed recently, and allow the printing with polymer pellets (granulates) [26]. Pellet based FDM printing has been already reported for biomedical materials, however, thermoplastic elastomers (TPEs) have not been extensively explored [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Pellet-based fused deposition modeling for the development of soft compliant robotic grippers with integrated sensing elements

Georgopoulou

Clemens

2022

Flex. Print. Electron.

View full text Add to dashboard Cite

Fused deposition modeling (FDM) has some advantages compared to other additive manufacturing (AM) techniques, such as the in situ integration of functional components, like sensors, and recyclability of parts. However, conventional filament-based FDM techniques are limited to thermoplastic elastomers with a Shore hardness above 70A, thus it has marginal compatibility with soft robotic structures. Due to recently emerging pellet-based FDM printer technology, the fabrication of soft grippers with low Shore hardness has become possible. In this study, styrene based thermoplastic elastomers (TPS) were used to print elastic strips and soft gripper structures down to a Shore hardness of 25A with an integrated strain sensing element (piezoresistive sensor). Printing on a soft rather than rigid substrate affects the integration of the printed thread on the substrate, because of the softness and relaxation, during the printing softness. It was seen that integrating the sensing element on a substrate with higher Shore hardness decreased the elongation at the point of fracture and the sensitivity of the sensing element. A soft compliant gripper structure with an integrated sensing layer was printed with the TPS-based elastomers successfully, and even due to the complex deformation of the compliant gripper structure, several positions could be detected successfully. Opened and closed position of the gripper, as well as, size recognition of spools of different sizes could be monitored by the piezoresistive printed sensor layer. The most sensitive sensing performance was obtained with the TPS of the lower Shore hardness (25A), as the value of relative change in resistance was 1, followed by the gripper of Shore hardness 65A and a relative change in resistance of 0.51. With this study, we demonstrated that pellet-based FDM printers can be used, to print potential soft robotic structures with in-situ integrated sensor structures.

show abstract

A Pellet 3D Printer: Device Design and Process Parameters Optimization

Cited by 12 publications

References 35 publications

Novel three‐dimensional printing of poly(ester urethane) scaffolds for biomedical applications

Novel three‐dimensional printing of poly(ester urethane) scaffolds for biomedical applications

Innovation in Additive Manufacturing Using Polymers: A Survey on the Technological and Material Developments

Pellet-based fused deposition modeling for the development of soft compliant robotic grippers with integrated sensing elements

Contact Info

Product

Resources

About