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How to build the PETamentor 2 (to make filament for 3D printing) In this step-by-step tutorial, I show you exactly how to build the PETamentor2 — a DIY machine that turns plastic water bottles into 3D printer filament. From the power supply to the puller, thermo-controller, and cutter, I walk you through each part you’ll need, how to assemble them, and how to wire everything so it works safely and efficiently. I also put my own little twist on some parts of the build to make the system work more