Heavy Duty Bearing

Hi,
this is my first attempt at constructing a bearing.
I found many designs online, but I was not satisfied with the overall strength.
I increased the wall thickness of the rings and added a appropriate cage, which holds 10 6mm softair BB's.
The inner ring consists of two pieces, which will snap together.
The inside diameter is 15mm, the outside 40mm.
Please consider that that design uses rather large tolerances, so very precise and well calibrated 3D printers may not achieve a good r