Video of the finished bearing on Instagram: https://www.instagram.com/p/BPA0LYlDdlO/

I wanted to create my own ball bearings for my filament rolls, and have experimented with the details. The outcome is this design, which is ready to print without additional support structure.

Simply snap off the support after printing.

If your printer is not precise, the tolerances may be too low for this print, resulting in balls stuck to the sides of the bearing.

Outer diameter: 54mm

Inner diameter: fits a 22mm rod

Print Settings

Printer:

XYZprinting da Vinci 1.0 PRO 3-in-1

Rafts: 

No

Supports:

No

Resolution: 

0.4mm nozzle, 0.2mm layer height

Infill:

20%

Notes:

This design is dated back to 2017 where I originally posted in on Thingiverse. Keep this in mind if you find the tolerances not on par with what is normal today.
https://www.thingiverse.com/thing:2080179

Do NOT print with support.
The print is prepared with support cones underneath each ball, which should snap right off after the print is completed.

If you use a different layer height, you may experience problems with the connection between ball and support is too strong and wont snap off.