Impact Strength and Morphological Properties of Plant-Derived Polylactic Acid/Polyamide 1010 Biocomposites Prepared Using Fused Deposition Modeling 3D Printing: Effect of Printing Speed and Raster Angle

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In this study, the effects of printing speed and raster angle on the impact strength and morphological properties of plant-derived polylactic acid (PLA)/polyamide 1010 (PA1010) biocomposites fabricated via fused deposition modeling three-dimensional (3D) printing were investigated.PLA and PA1010 were first melt-compounded using a twin-screw extruder, followed by filament fabrication using a single-screw extruder.The resulting biocomposite filaments were then 3D-printed at various printing speeds (45 mm/s, 110 mm/s) and raster angles (0°, 45°).The PLA/PA1010 biocomposites exhibited high impact strength at fast printing speed.In addition, biocomposites printed unidirectionally at a raster angle of 0° showed considerably higher impact strength compared with those printed at 45° due to the differences in in-situ microfibrillation and print path coverage depending on raster angle.The findings suggest that the combination of fast printing speed and increased print path range can effectively enhance the impact strength of 3D-printed PLA/PA1010 biocomposites by contributing to the development of in-situ microfibrillation of PA1010 within the PLA matrix.