Here is a video of my printer doing a calibration.
Calibrating the print head height is proving to be quite difficult. I found a good article on Calibrating a Delta 3D Printer by Minow.
Delta Printers Only
This calibration process is for a delta style printers only (like my 3DR)
As you can see the prints are getting significantly better.
Its not quite there, but I would say its close.