This is a remix of "Fully Parametric Drag Chain" that has fewer overhangs and the angle is determined by the faces as you can see in the printscreen from OpenScad.

I've taken the original scad file and modified it so all of the features of the original part should still work the same.

Due to the tolerance needed for fitment the actual angle might be higher than what is set as a parameter! Do a test print and check. My 25° link I printed as a test bends to actual 30°.