I needed a way to mount a small speed square to my laser engraver (falcon2 pro 22w).  I have this old square that I think a relative made probably before I was alive but somehow it's still in my possession. It's perfect for lining up material on the engraver. 

Print with a brim standing up if you do not want to use support. I used a thin stripe of 3M VHB adhesive tape to mount it to my laser engraver.