Filament Spool Holder

myminifactory

This filament spool holder utilizes 40 - 5/16 in (7.9375 mm) ball bearings. The ninja version adds a 1.75 mm track along the bottom where you can insert 1.75 mm NinjaFlex filament to prevent it from sliding around, as seen in the picture of the black version above. It should work with a variety of spool sizes; narrow spools (<55 mm wide) can be placed across the longer length, while wider spools should be placed across the shorter width. If 5/16 in bearings are not available, you can likely scale the print slightly and use 8 mm bearings. You should probably monitor it for a while to see if it works with your spool before leaving it unattended.