This holster fits on most belts, and it should fit all 6" calipers. I use it a lot for my job as a mechanical engineer. The calipers sit securely, but can be easily removed and returned with the open-channel design of this holster, unlike traditional holsters where the entire length of the calipers must be inserted into a hole.
Its geometry is very printer-friendly, and anyone should be able to print it successfully.
Print upright, no supports required. Maximum overhang angle is 45 degrees.