I was requested by a friend of mine to modify my original double bearings to add more layers/rings to it.
It may not work as well as the double bearings, so please post feedback on how these ones print on your printers so I can make adjustments accordingly.
There are 2 STL files here.
Triple ball bearings - 62 balls
Quadruple ball bearings - 106 balls
Print with raft and supports (30 degree horizontal). Give the balls a bit of pushing and cleaning, then the bearings should work right away.