I have one of the original right hand Ploopy trackballs.

- It comes in a kit and as you need to assemble it, you feel emotionally attached to it

- The designer (Colin) probably has big hands. I have a small hand and it doesn't fit right.

- The 3d printed texture is great.

- The ball doesn't 'flow'. It doesn't keep momentum. You apply a strong movement and it spins dead within the second.

- I absolutely love it is open source, but there is not much of a community around it, probably because the barriers of entry are quite high. I never found the time to hack it myself.

- It tracks the movement extremely well. Accuracy, precision are awesome. Better than any other trackball I have (and I have MANY). On par with the logitech mx master.

- The position of the thumb wheel is not good for my hand. After months of use it started giving me RSI. And now everytime I use it, I notice within the hour that something is not right.

My perfect trackball would be the ploopy:

- With a smaller body for small hands

- With momentum in the scroll wheel ALA logitech mice

- With a different position for the scroll wheel

> - With a smaller body for small hands

That's actually a nice idea. It would be great to have three sizes, like S, M and L.

Even better, some kind of configuration that accepts a range of values and then generates a model. Dactyl keyboards work this way

https://github.com/adereth/dactyl-keyboard