Use metallic spheres, it is cheap and easy to find, just adjust the parameters to match.
The 2 bearings uploaded (Ciclop and Sample) use spheres of 10mm;
The values for "bearing rings thickness" and "sphere diameter" are very importante,
you need adjust they with care.
- No cage = Print the full set and you need a full ring of spheres;
- One cage = Housing cage, Simple, just push and play;
- Two cages = Best, need glue, 50+50 top and bottom;
- Full cage = Print the full set, just for precise printers;
That is all.
No cage, print the bearing at once: (add support material or make the bearing and the spheres with same height)
One cage, just push to housing:
Two cages, print it 2 times, mount all and glue the centers:
Full cage, add support material and print the bearing at once: