Damayanti AM, Muttaqin KI. Optimization in Extrusion Process for Polypropylene and High-Density Polyethylene Pellets in Additive Manufacturing of 3D Printing Filament. etj [Internet]. 2024 Nov. 26 [cited 2024 Dec. 22];9(11):5544-8. Available from: http://everant.org/index.php/etj/article/view/1621