Craftbot Spool Holder

Sometimes the spool seems to grab the Craftbot hanger rod and get swung off center by the extruder, so I created this. By using a bearing on each side of the rod, the spool is supported and will not swing, but rotates easily. Spools with an ID from 50mm to 60mm should work fine - which includes all the eSun, Monoprice, and CraftUnique filaments I have. To adjust for the width of the filament loosen the rear bracket and slide it on the hanger. The spool can still be easily removed with this in pl