Logitech M570 Wireless Trackball 3D Model $49 - .ma .c4d .max .obj .3ds - Free3D
A Trackball So Good You Can't Buy It | Hackaday
A completely open-source, 3D-printed thumb trackball. All design files available. Complete assembly instructions. Check comments for details. : r/functionalprint
Amazon.com: American Mouse Wired Trackball Lazy Finger Design Drawing CAD Rendering 3D : Electronics