This project report investigates the feasibility of using waste polypropylene (PP) plastics to create 3D printer filaments. It examines the melt extrusion process, focusing on parameters like cooling, melt flow rate, and the use of additives to reduce polymer shrinkage, a significant challenge in 3D printing PP. The study explores the history of 3D printing, the materials used, and the specifics of polypropylene, including recycled PP. Tensile testing methods are outlined, and factors influencing shrinkage, such as material type (amorphous, semi-crystalline, fiber-reinforced), wall thickness, and processing conditions, are discussed. The report also touches upon the mechanical properties of recycled waste PP and different types of shrinkage, including volumetric shrinkage, aiming to provide new knowledge and research results for optimizing PP filaments for 3D printing applications.
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