raspberry pi 400 keyboard hinged wall mount

I wanted to keep my raspberry pi keyboard out of the way when not in use.

This is a work in progress - things you might want to note:
- The keyboard is not held very securely with the current design. It is fine if you don't knock it.
- Cracking the hinge can be a challenge, especially with PETG. Consider increasing elelphants foot compensation. I found I didn't need to force it to much if I applyed some heat to the base of the hinge.