The purpose of the paper is to design an extruder to ensure continuous flow of material and retraction of the melted material into the extruder of the printers operating with pellets ABS, PLA or other materials used. The way in which 3D printers work differs from that of plastic injection machines by the fact that for the execution of a piece it is necessary for the extruder to position itself at different points of the surface without depositing the material. If it does not stop the flow of material during the repositioning move, then the executed piece will be compromised. Designed pieces were designed with the help of the Inventor Software and it was determined experimentally whether the extruder is working. It was found that the original design did not fully meet the requirements of the coat-coat process, which is why rethinking of the extruder’s operation and modifications to ensure retraction of the material is necessary.
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 Albu, S. (2015), The Coordinate Transformations Method Combined with AutoLisp to the Archimedean Spiral Representation in Autocad, Scientific Bulletin of the “Petru Maior” University of Tîrgu Mureş, ISSN 2285-438X, vol.12, no.2, pp. 22-25.
 Berce P., Pacurar R., Balc N. (2008), Virtual Engineering for Rapid Product Development. New Aspects of Engineering Mechanics, Structures, Engineering Geology, Book Series: Mathematics and Computers in Science and Engineering, pp. 195-200.
 Cheţan P., Boloş V., Pozdîrcă A. (2014), Influence of plane-parallel finishing trajectories to the roughness obtained by milling of spherical surfaces, Procedia Technology, Elsevier, pp. 411-419.
 Pozdîrcă A. (2010), Calculation and representation of curves and surfaces „Petru Maior” University Press, ISBN 978-973-7794-91-8.
 Pozdîrcă A., Albert K., Cheţan P. (2004), Inventor–Parametric modeling, CAD&CAM collection, Modul 04.
 Pacurar, R., Balc, N., Prem, F. (2011), Research on how to improve the accuracy of the SLM metallic parts, Proceedings of the 14th International Conference on Material Forming Esaform, Queens Univ. Belfast, pp. 1385-1390.
 Mikolajczyk T., Malinowskia T., Moldovan L., Fuwen H., Paczkowski T., Ciobanu I. (2019), CAD CAM System for Manufacturing Innovative Hybrid Design Using 3D Printing, Procedia Manufacturing, vol. 32, pp. 22–28.
 Simon M., Grama L., Ganea M. (2012), Study of Improving Static Rigidity on Machine Tool Structure Using Concrete Component, The 6th Edition of the Interdisciplinarity in Engineering International Conference “PetruMaior”, pp. 26-29.
 Simon M. (2015), Experimental research regarding rigidity improvement of hollow machine tools structures using aluminum foam, Procedia Technology, vol. 19, pp. 228-232.
 Socaciu T., Pop L. (2009), New experimental research concerning the improvement of enegetic parameters in the extrusion using the friction forces as active forces, The International Conference Interdisciplinarity in Engineering INTER-ENG.
 Mocian I., Cazacu R. (2014), Software for computer aided manufacturing with the MORI SEIKI CNC milling machine, Procedia Technology, vol. 12, pp. 369-374.
 Albu, S. (2018), Development on the production of a new type of extruder used in additive manufacturing, FDM technology Procedia Manufacturing, vol. 22, pp.141–146.