I needed a bend meter / angle nestle (if this is the correct translation in English) for cutting some base boards during renovations. This is a simple model done in OpenSCAD. You need to use a M4 nut plus some short M4 screw. Also try to get a thumbscrew with smaller diameter for tightening the bend meter when in position. I had some thumbscrew laying around but it was too big. So I guess I have to design a smaller one.

Update: I added some sort of “thumb screw” which doesn't interfere with a wall or other close objects when you take angles. I used a M4x25 screw which had a really tight fit. For other screw heads you might need to adjust the thumb screw. Simply check the file “Klemmmutter.scad”. Should be pretty obvious.