Hall-o Z-probe

This is a modified version of [626Pilot's](http://www.thingiverse.com/626Pilot/) z-probe to be used with hot ends that are lower placed bellow the effector.


I beefed up the mounting holes because mine kept snapping with PLA. I'm using it now, the one downside is that if you have the magnetic arms it tends to stop the probe from retracting. I fixed this by placing another cube magnet behind the stationary one.