LulzBot Mini, Ball Bearing Spool Adapter

This is a remix of my adapter bushing for 56 mm ID x 70 mm width spools, which fits on the stock spool arm of the LulzBot Mini. I modified the adapter to use (4) 10 x 15 x 4 mm ball bearings (the diff bearings from the Team Associated RC10 B5m/T5m RC car). I also removed as much of the extra material as I could, to reduce the printing time.

This adapter should fit 65 mm wide spools with an inner diameter of 47 mm to 60 mm, but I've only tried it with 56 mm and 57 mm ID spools.

I've also