Lulzbot TAZ retractable Z-probe auto bed level compensation with G29 Mod

This mod makes manually leveling the build bed a thing of the past.This is for Advanced users only, Firmware and hardware modification is required and likely will affect any warranty on the machine. This also reduces your X printable area by about 8mm, at the max X position.

video's of the prototype in action:
deployment: http://youtu.be/tMdS1dXkoAc
printing with Z motion http://youtu.be/c8dM1KpBXJ8

Inspired by this: https://www.matterhackers.com/news/automatic-printer-calibration-up