I finally bought a 3dconnexion Compact Spacemouse, and started designing something to go over it that would have buttons or keys right there. While I was doing this I got the idea to create a little dust cover for it.
The model is on its side for some reason. You'll have to fix that before printing, obviously.
I printed it in the same direction it would go over the mouse and used painted on supports on the inside top and a little more on the top of the cable arch.
I used Atomic Filament PLA at 0.3mm layer height with 20% infil.
The author hasn't provided the model origin yet.