Effect of Infill Value on Decay Resistance, Thermal, and Mechanical Properties of 3D Printed Polylactic Acid Composites Filled with Wood Fibers

Yufeng Sun, Danbee Lee, Yapeng Wang, Suiliang Li, Jilai Ying, Xinping Liu, Guangyin Xu, Jaegyoung Gwon, Qinglin Wu


Polylactic acid (PLA)-based composites with wood filler were 3D-printed using fused deposition modeling (FDM) at different infill settings (i.e., 10 to 100%) to evaluate their strength and biodegradation properties. Microvoids were present in the commercial wood-filled PLA filaments. Wood-PLA filament had reduced thermal stability compared with mineral-filled PLA filament due to the presence of thermally degradable wood flour. The printed composites had a denser internal structure with increased infill. The flexural modulus of elasticity and modulus of rupture also increased with infill value. Sixteen-week fungi test performed using a brown rot, Postia placenta, and a white rot, Irpex lacteus, did not lead to significant sample weight loss and strength reduction for composites at various infill values. Therefore, 3D printed composites with PLA-based filament containing 30 wt.% wood fiber were shown to be resistant to biodegradation by common decay fungi.


Wood-filled PLA; 3D printing; Infill rate; White rot; Brown rot

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