Inductive Sensor Auto-leveling Mod for Makerfarm Kits

Inductive Auto-leveling Modification for Makerfarm kits with Mount included. This requires swapping out one 15mm M3 screw for a 20mm M3 on the extruder carriage.

You'll need:
firmware update/change to Marlin to enable Auto-leveling. (Markerfarm uses Marlin)
printed bracket
inductive sensor like this:
http://www.ebay.com/itm/New-LJ12A3-4-Z-BY-Inductive-Proximity-Sensor-Detection-Switch-PNP-DC6-36V-/361213241090?pt=LH_DefaultDomain_0&hash=item5419fca702

In Marlin's config.h you will