Quick Change Filament Holder Bearing Couplers

Wanted to make bearings fit into this spool holder I had already printed, so I made these little couplers that fit into the holes on the uprights, that also fit standard 608 bearings.

Print a simple rod to go between the two or perhaps find a long bolt that the filament spool can rest on. Since this incorporates bearings it should reduce most of the drag or pull.