Thrust bearing for 13mm steel balls. Needs 20 balls per bearing.
Originally designed for a scrollable background on stage. Works as a turntable or lazy susan.
Feature video shot of the bearing parts... on the bearing turntable - just mounted to a wooden plate and a sheet of paper: https://youtu.be/D4AIwcGMFz4
Included 3 parts:
Can be used with 2 lower races as well. Upper race includes a little guard so it does not slip away.
Load the balls by inserting a ball in every 2nd hole, put on the upper race, then turn 180° and load remaining balls,, put on lower race.
Upper and lower race include counter-synced screw holes.
Can hold at least the weight of 2 humans, in PLA.
Fusion 360 file included.
designed to need no support or rafts, lots of contact on lower layer. print with 3 or 4 bottom and top layers to make sturdy. Each part took about 3 hours for me.