Our spools are made of black polystyrene. Their dimensions have been preset in our machine so that you can start spooling your filament straight away, skipping the calibration step. Perfect for tight spooling of any filament (both 1.75mm and 2.85mm). Our Devo Spools can be recycled easily into filament, using our Shredder Shr3d It and a Filament Maker. We successfully turned our spools into 3D printed parts!