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
Here's ones i'm not sure how smooth they are. If you know, leave a comment please.
If you have a question, put $5 at patreon and message me.