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Polymers (Basel). 2018 Mar 13;10(3). pii: E313. doi: 10.3390/polym10030313.

Strength of PLA Components Fabricated with Fused Deposition Technology Using a Desktop 3D Printer as a Function of Geometrical Parameters of the Process.

Author information

1
Department of Physical Metallurgy of Non-Ferrous Metals, National University of Science and Technology "MISIS", Leninskiy Prospekt 4, NUST MISIS, Moscow 119049, Russia. kuznetsovve@misis.ru.
2
Department of Physical Metallurgy of Non-Ferrous Metals, National University of Science and Technology "MISIS", Leninskiy Prospekt 4, NUST MISIS, Moscow 119049, Russia. Solonin@misis.ru.
3
Department of Physical Metallurgy of Non-Ferrous Metals, National University of Science and Technology "MISIS", Leninskiy Prospekt 4, NUST MISIS, Moscow 119049, Russia. darikcr@gmail.com.
4
School of Textiles and Design, Reutlingen University, Alteburgstra├če 150, D-72762 Reutlingen, Germany. Richard.Schilling@Reutlingen-University.DE.
5
Department of Physical Metallurgy of Non-Ferrous Metals, National University of Science and Technology "MISIS", Leninskiy Prospekt 4, NUST MISIS, Moscow 119049, Russia. aztapps@gmail.com.

Abstract

The current paper studies the influence of geometrical parameters of the fused deposition modeling (FDM)-fused filament fabrication (FFF) 3D printing process on printed part strength for open source desktop 3D printers and the most popular material used for that purpose-i.e., polylactic acid (PLA). The study was conducted using a set of different nozzles (0.4, 0.6, and 0.8 mm) and a range of layer heights from the minimum to maximum physical limits of the machine. To assess print strength, a novel assessment method is proposed. A tubular sample is loaded in the weakest direction (across layers) in a three-point bending fixture. Mesostructure evaluation through scanning electronic microscopy (SEM) scans of the samples was used to explain the obtained results. We detected a significant influence of geometric process parameters on sample mesostructure, and consequently, on sample strength.

KEYWORDS:

additive manufacturing; anisotropy; desktop 3D printing; digital fabrication; fused deposition modeling; fused filament fabrication; interlayer bonds; mechanical strength; polylactic acid

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