This is a thingy that helps with ejecting the trackball of a Logitech MX Ergo.
I didn't need this with my old M570, as the hole below the trackball was large enough for my pinky finger to poke through. The MX Ergo's one is much smaller though, so that didn't work anymore.
This is a quick & easy print. Any filament works, no brim or supports required. It takes around 13 minutes to print on my Ender3.
OpenSCAD source code is available at https://github.com/nilsding/DDDobjs/blob/main/trackball-ejector/trackball-ejector.scad
The author marked this model as their own original creation.