RepRap Prusa i3 bed auto-level UP1

Reference http://www.thingiverse.com/thing:273805
Applicable optical version and have couplings (and it will fight), while fixed in m3 m5 Screws fixed version, more importantly, is applicable Wade J-Head extrusion head module (E3D die because of relatively high, so the original members more applicable E3D, but Wade J-Head extrusion head module and a high degree of coupling is limited)