Dual layer 6mm BB bearing, 1.2" outer diameter, 0.34" inner diameter originally for fiberglass tent pole

thingiverse

This bearing uses 16 6mm BBs and spins very freely. It is semi loose but only a little, as it was designed as if the BBs were 6.2mm rather than 6mm. The ID is 0.34 inches and the OD is 1.2 inches. There are 4 parts: the outer housing, inner housing, retainer, and the lock. First, place the outer housing, inner housing and retainer into place. Next, place a BB into one of the holes inside of the inner housing. You may need to rotate the bearing until the BB drops partially into the retainer. After this happens it should no longer spin, and you should now press the BB into the bearing until it clicks into place. Needle nose pliers worked well for me. Repeat this 7 more times on that side and 8 more times on the other. I would recommend counting out the BBs before hand because it is easy to forget some. Finally, press the lock into the hole in the inner housing. The only significant print settings I used were a 0.12mm layer height.