Eryildiz, MeltemKosa, ErginAkgun, Ismail CemYavuzer, Bekir2025-03-092025-03-0920250892-70571530-7980https://doi.org/10.1177/08927057241259761https://hdl.handle.net/20.500.12662/4660This study investigates a novel post-processing technique aimed at enhancing the mechanical properties of 3D-printed polypropylene-carbon fiber (PP-CF) composite parts. The method involves printing components with internal voids to reduce weight and printing time, subsequently filling these voids with a low-cost resin known for its superior mechanical properties. Through systematic experimentation varying infill density and pattern, key quantitative findings were obtained. Tensile strength generally increased with higher infill density, reaching a maximum of 55.664 MPa for the resin-filled triangle infill pattern with 60% infill density. Impact energy showed a decreasing trend with increasing infill density, with the highest impact energy of 0.5 J recorded for the resin-filled triangle infill pattern with 60% infill density. Microstructural analysis revealed that the triangle infill pattern at 60% infill density exhibited the most effective resin penetration, contributing to superior mechanical performance. These findings emphasize the importance of infill pattern selection in resin distribution and mechanical enhancement in 3D-printed composite materials.eninfo:eu-repo/semantics/closedAccess3D printingpolypropylene-carbon fiber compositeinfill patternresin-filling techniquepost-processingArticle10.1177/089270572412597612-s2.0-851956042058923Q187838WOS:001242009000001Q2