Extra-Large Spool for Homemade PET filament

Winding homemade PET filament onto regular 1kg spools has always been a nightmare. PET is stubborn and just doesn’t want to stay put. Using spools with a larger diameter makes the process much more manageable. I’ve made dozens of oversized spools out of cardboard over time. Since I’m not exactly short on filament, I decided to design and 3D print my own!