AnglEase is a tool for quick and easy angle measurement and tool setup. It was designed by the person who originally posted it on Instructables here: https://www.instructables.com/id/AnglEase
It was designed to be a highly precise machined metal part. I took the detailed measurements given by the designer and programmed the part in OpenSCAD. A 3D printed version isn't nearly as precise as a machined part but I believe good enough for many uses.
It uses a 5mm diameter bolt at least 25mm long.
The orientation of the parts shown is not the best orientation on the print bed.
Note the license is "Attribution Non-Commercial No Derivatives" by request of the inventor (I'm not the inventor). Contact this person for permissions beyond this: https://www.instructables.com/member/dustee1000