Internal angle finder

This angle finder is suitable for measuring angles detected externally to the object.

I also designed the version for internal angle measurements, see https://www.printables.com/it/model/857134-angle-finder-v2

It needs:
1 wing nuts M5 
1 hex head screws M5 x 16 

Print the "External-Angle_finder GRADUATED VERNIER.pdf" file on self-adhesive paper and paste it on "Ext-Angle_finder-Sc_in" aligning the references (center and lines of 0, 90, 180 degrees)