A small angle gauge that could technically fit on a keychain, but how often do you really need to know the angles of things? Often enough to put an angle gauge on a keychain? If you insist.

Each Step is 1/8" tall btw

I recommend a 0.2mm nozzle if you want the numbers to be crisp, but 0.4mm is fine. You could always scale it up, but what's the fun in that?