20mm x 40mm Airsoft Fidget Ring or Ball Bearing
thingiverse
To create a free-running toy, use 20x40mmLoosey.stl and carefully trim it. If needed, glue the inner race of an original bearing using acetone. Check for penetration and remove any globs that may cause obstructions. Trim along the raceway and assemble with 6mm Airsoft balls. Snap the outer halves together, and if it spins freely, apply a little glue. Loosey has a .1 mm slop while Loosey01 has a .15 mm slop for a smooth operation right off the printer.
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