sphere holder

I'm not the best with 3D but I think this illustrate the fact that we also need some kind of navigational texture on the holder as well

ok, the one is black is just showing the model

the reason why I have the groove at different height is purely from ergonomic reason.

Its because when you grip this holder, you would grab it from the side with your thumb and your 4th finger and the pinky. The middle finger and the first finger will be use for rolling the ball

Here is the transparent version