Trackballs That Can Spin
Here's a trackball design that spins!
Here's idea using air bearings:
True Spin Balls
As far as i know, only these 2 truly spins. I think they are using ball bearing.
Ranking of Trackball Ball Friction
From most smooth to less.
Elecom DEFT Pro
If you have a question, put $5 at patreon and message me.