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608 ballbearing (22mm external diameter and 8mm internal diameter)

Print in place with supports for the balls.

2 versions :

608 Ballbearing with higher tolerances. A bit of play on the final result but usually turns more freely 

608 Ballbearing 9BBS, with less play but can sometimes be a little rough when turning (well calibrated printer needed, i still manage to get it going with my well tuned ender 3)