Ender 3 bearing supported spool holder

This design helps the extruder a bit, with the bearing mounted spool holder the extruder requires less force to forward the filament. It is compatible with Creality Ender 3 models listed above, as well as those that use the same spool holder metal plate. Assembly requires only two 608 bearings. These can be easily snapped into the holder. Care must be taken when printing the roller so that the small pin does not break off when the support is removed. 85mm wide or narrower spool with a bore of approximately 45mm or larger can be used comfortably.