Sunny Spinner toy

This spinner is made for five 0,5" (or 12,7 mm) steel balls, I took mine from a GeoMag toy set that I had lying around. The inner (spherical) radius of the steel ball holders is 13 mm but the opening is exactly 12,7 mm, so including a slight shrinkage of the holder post printing, the balls should be a bit difficult to push into the holder, but once mounted they should have a loose fit.
The bearing is a 7x19x6 mm ball bearing (axis x diameter x thickness).
I have split the model into three fil