There are two version: for M4 screws and for M5 screws

The M5 version can be made with relief vernier with differend filament color 
or with a flat vernier printed on a self-adhesive paper to be glued on the version M5-1a

It needs:
4 wing nuts M5 (or M4 depending on chosen model)
4 hex head screws M5 x 16 (or M4 depending on chosen model)

Print Settings:

Orientation: Print the pieces as oriented
Rafts: No
Supports: No
Resolution: 0.2mm
Infill: 10 ÷ 20%
Filament: Any PLA

This angle finder is suitable for measuring inside corners

I also designed the version for external angle measurements, see https://www.printables.com/it/model/863163-internal-angle-finder

Print the "Internal-Angle_finder GRADUATED VERNIER.pdf" file on self-adhesive paper and paste it on "Angle_finder-M5-1a" aligning the references (center and lines of 0, 90, 180, 270 degrees)

If you download/enjoyed this file, please leave a like Thanks