LM2596 (Buck Converter) DIN Mountable - M3

I've changed the diameter of the screw hole from 2 mm to 2.8 mm to make it work with M3 screws up to 8 mm long. No heat-set inserts required. screw directly into the plastic.

Like the original author has noted, check to make sure the converter you have is compatible with the file. There are apparently 3 versions.