Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5061638.

Customizable Bearing into which Balls are loaded. - Parametric Marbles, BB's, Steel Balls, etc. Very Smooth operation if the ball size and extrusion correction are set properly Balls are dropped in from the top, of the race and a race seal is used to block the fill hole.

Interior diameter/Exterior diameter , split point split size, race Z offset can be set allowing the inner race to be offset from the outer race.

Tabs can be used to mount the bearing to a solid support.