This is a tool nholder for Starrett 505P-7 Mitre Protractor.

Use it with 2x0 Flat Brackets from the DDD system to mount on your board. Insert the pin pieces between the sides and the tool holder. I also included files for the brackets with a slightly thinner back hook that fits better in my Wall Control board. 

I printed the tool holder in PLA+ with 40% infill and 3 walls. No supports should be needed.

I printed the brackets in PLA+ with 40% infill 15 walls, and no supports.