Low Friction 608 Bearing, with working cage

Started to explore a roller bearing for integrating into a single-print-in-place fidget spinner
(see https://www.thingiverse.com/thing:4876658).
After looking at a few 608 bearings from Thingiverse (see below for references) decided to explore my own design with a working cage.

These are concept explorations for 608 roller bearings with an integrated working cage to keep the rollers spaced and realize a proper rolling function with low friction.
The roller guides provide reasonable lateral stiffness.

Posted designs:
1) Asymmetric cage with a guide groove in the rollers (print with cage down).
2) Asymmetric cage with guides on the outside of the rollers (print with cage down).
3) Center cage with rollers (print with cage supports down)
4) Symmetric design with diabolo shaped rollers and a central cage

Some geometry detail:
Minimal clearance on the rollers is 0.20 mm, which easily released with a light push.
Slope of overhangs is 55 or 60 degrees.

Reference to other 608 designs (Remix search is not working for me):
https://www.thingiverse.com/thing:2746804
https://www.thingiverse.com/thing:3002837
https://www.thingiverse.com/thing:2543414
https://www.thingiverse.com/thing:4821342

Print Settings

• Supports: No

• Infill: 15

• Filament:  PLA
  

Notes:

• Meant to be printed at 0.15 mm layer thickness

• Be careful to avoid elephant's foot, it can cause gaps to close in the first layers.

• Printing with high infill caused drift in the cage first layers.

• Printed on Prusa Mini+ with regular 0.15 Quality settings

'

Creator's Note

I originally published these PIP 608 concepts in 2021.

I got back to bearing concept design and designed two assembled bearings that work really well, with low friction and tighter fit than PIP bearings. If you're looking for a practical solution for a fully printed 608 bearing check them out: