Ball Bearing - Steel Balls

thingiverse

This Ball Bearing takes eight 7/16inch balls. Print the inside and outside rings and two of the cages. I use small double sided tape to bind the cages. It's enough to hold them together because the groove in the rings and the balls take the load. Producing a ball bearing isn't really in 3D FDM's target zone. The steel balls are manufactured to 1/10000th of an inch, and a steel bearing would be machined and ground to about the same precision. A 3D printer isn't capable of anything like this, and inaccuracies with extrusion bulge make for a rough running model. You can get the source for this from volumize3d.com. You can easily change the number of balls, inside or outside diameter via variables and rebuild it.