RigidBot Z-Limit Screw

A variation of the [RigidBot Z-stop Adjustment Screw](http://www.thingiverse.com/thing:362662) by [mikedifilippo](http://www.thingiverse.com/mikedifilippo/designs)

This one uses a short 5mm x 8mm flathead screw and 4mm x 8mm button head screw. The z-limit switch needs to be rotated by about 45 degrees. The range of adjustment of this design is very limited, only a few millimeters, but works with my setup, which uses a 1/8" polycarbonate plate on top of the build plate. I'm not sure how it would work if printing directly on the build plate.