I saw CHSEngineering's wall mount for their Keyboard and mouse and while I just printed the keyboard mount I wanted to do something a little more custom for my mouse.

The dimensions didn't come out exactly as I had hoped but it did come out well enough to get the job done. I'd recommend opening up the cup portion just a little more but the angle seems to be about right and it's "good enough" if you want something to be able to just print.

Units should be in "mm."