Damayanti, Annisa Maulidia, and Katiko Imamul Muttaqin. “Optimization in Extrusion Process for Polypropylene and High-Density Polyethylene Pellets in Additive Manufacturing of 3D Printing Filament”. Engineering And Technology Journal 9, no. 11 (November 26, 2024): 5544–5548. Accessed December 22, 2024. http://everant.org/index.php/etj/article/view/1621.