608 Ball Bearing (good tolerance)

thingiverse

Tested many 1-piece or many-pieces ball bearings around and none of them worked. They came out in 1 solid block, had to be mounted for hours or simply had too much friction. So I made this. I'm using it in light spinners (that usually don't work with a metal and heavy bearing in the middle) and it's like a charm. Doesn't even require to be oiled again after the first time. I suggest printing it with light supports only touching buildplate, and then just remove them with a cutter. https://youtu.be/72AY1O8pVXE