Summary This is the free printable version of our Filament Holder, designed for ATOM 3D printer. The entire assembly mounts with a screw, so it can also mount on other things. All the parts that you need: 。M3 hex nut 。M3 15mm screw 。M3 25mm screw 。M3 washer 。M3 T slot nut 。M5 washer x 3 。8227 608 bearing 。40.585 extension spring Visit our official site: http://www.atom3dp.com https://youtu.be/v6NliOdWbFo