Airwolf 3d v5.5 Harbor Freight Indicator Trammer

This will hold a Harbor Freight or Grizzly indicator to the hot end bed of an Airwolf 3D v5.5. It will probably also work with the XL.
You will also need to replace the stock back cover with a flat back cover. You can find that thing here: http://www.thingiverse.com/thing:167459
The indicator tip might not hit your build plate before the hot end does. You can either buy a tip kit, or get a 4-48 screw of whatever length you choose to fit in the tip. I bought a 1.5" SS 4-48 pan-head screw for