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 need to enable the Autoleveling features. It might make more sense to download the newest Marlin and reconfigure it. Makerfarm does not currently host Marlin versions that have auto-leveling enable-able.

You'll replace the z-end stop with the sensor which will sense a piece of foil tape on the bed. Marlin's auto-leveling supports the sensing of multiple level points. This mod only uses 4.

More updates on this to follow...

Thanks!

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More detailed instructions soon...