Introducing the Mod Mouse. This is a modular shell for the Bambulab wireless mouse kit. Its special features are that it has screw holes for mounting different parts and accesories to the main body. To start off, I've made a thumb and pinky wing. If you use the onshape link below, you can design your own accessories to go with it. The main shell will work without anything added to it, in this configuration it is a simple ergonomic shape.

https://cad.onshape.com/documents/e6760b8cc7ace67dc1472317/w/6dd3e2d86222165da421b4c9/e/6b59494f7b13b8aadff028d9