belt_clips: fix graphical artifacts with coincident faces
belt_clips: refactor to simplify and enable reuse
Merge branch 'master' of https://github.com/jcdoll/kossel
Gave the hex nut more space in the zprobe clamp

If the hex nut is squished against the clamp then it can cause to
failure during overtightening. I increased the room so that it's a loose
fit.
Reset the angle in the retracted position

I have been overly aggressive and reduced the angle of the ledge that
the hex key sits on when retracted. This resets the angle to 35 degrees.