Roller Switch Z probe

Still a work in progress, I'll update when I print and test some. This is a z probe that uses the inherent springiness of a roller switch to push the probe back down and hold the probe in the "up" position after bed leveling.

I will get some better picutres of it in action. There is a small nylon spacer on the 3mm shaft that pushes up against the roller part of the switch and is pushed back down unless the probe is pushed past the wheel in which case it is held UP. I originally thought a m