DIMENSIONAL ANALYSIS OF PLA AND PETG PARTS BUILT BY OPEN SOURCE EXTRUSION-BASED 3D PRINTING

por: Leonardo Santana, Jorge Lino Alves, Aurélio da Costa Sabino Netto

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Ano: 2019

Instituições de ensino: Faculdade de Engenharia da Universidade do Porto, Nenhuma, Instituto Federal de Educação, Ciência e Tecnologia de Santa Catarina

Idioma: Ingles

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Resumo

Widespread open source initiatives within the context of extrusion-based 3D printing have made this technology accessible to all levels of users. However, aspects such as low dimensional quality of the parts produced, or difficulty in interaction with the process parameters and the printing materials, affect the satisfaction of the consumers of these systems. In this sense, the goal of this article was to contribute to the acknowledgement of the 3D printing system, and thus to the relation user-machine, through the analysis of the influence of material types — Polylactic Acid (PLA) and Poly(ethylene terephthalate glycol) (PETG) — and process variables (deposition strategies and number of perimeters), confronted in Taguchi's experimental design, varying the internal and external dimensions of the printed parts. Additionally, the masses of the built samples were measured, and the materials were characterized by a melt flow index (MFI) test. The results demonstrated that the dimensions of the manufactured components were strongly influenced by the type of material used due to the greater variations in the filament diameter (before being processed) when compared to the nominal value and the high fluidity of the polymer, and by the deposition strategies. PETG stands out as a material with good printing capability, with better dimensional quality along all the parts' directions, making it suitable for applications that require greater conformity in measurements


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