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<p>Polylactic acid (PLA) and recycled PLA (Re-PLA) samples were produced using a 3D printer with 50 % fill rate, vertical and horizontal truss orientation, and layer thickness of 0.10, 0.15, and 0.20 mm. Mechanical, wear, and SEM analyses were performed. Results show that printing orientation has a stronger influence on tensile, bending, and compression strength than layer thickness. Vertically printed PLA and Re-PLA samples exhibited higher strength and ductility, while Re-PLA horizontal samples lacked a clear yield point. The highest hardness (76 shore D) was measured in PLA-V at 0.20 mm thickness. Surface roughness increased with layer thickness and was greater in horizontal and Re-PLA samples. Friction behavior varied by filament type and thickness, with 0.1 V samples showing the highest values. SEM images revealed brittle fractures in PLA and more ductile but structurally irregular fractures in Re-PLA, with more cracks and gaps-factors contributing to its reduced mechanical performance.</p>

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Effect of print orientation and recycling on the mechanical and tribological properties of 3D-printed PLA polymer materials

  • 期刊论文

  • 发表日期：

    2025年10月8日

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  • Şakir Altınsoy

摘要

Polylactic acid (PLA) and recycled PLA (Re-PLA) samples were produced using a 3D printer with 50 % fill rate, vertical and horizontal truss orientation, and layer thickness of 0.10, 0.15, and 0.20 mm. Mechanical, wear, and SEM analyses were performed. Results show that printing orientation has a stronger influence on tensile, bending, and compression strength than layer thickness. Vertically printed PLA and Re-PLA samples exhibited higher strength and ductility, while Re-PLA horizontal samples lacked a clear yield point. The highest hardness (76 shore D) was measured in PLA-V at 0.20 mm thickness. Surface roughness increased with layer thickness and was greater in horizontal and Re-PLA samples. Friction behavior varied by filament type and thickness, with 0.1 V samples showing the highest values. SEM images revealed brittle fractures in PLA and more ductile but structurally irregular fractures in Re-PLA, with more cracks and gaps-factors contributing to its reduced mechanical performance.