The build is ready, I am now working on the firmware.
Recently I had an idea how to implement XYZ Calibration, and now its implemented, in beta state. It doesn’t save anything, but it produces a report which can be used to configure the printer. The printer is also checking if the XY are perpendicular and displaying information how big is the difference, and how to reduce it (which rod should be moved backwards/forward).
Its recommended to run the XYZ Calibration from LCD while being connected from the PC by serial port (using eg. Prointerface or Repetier-Host).
The idea of moving to top of frame is taken directly from Original MK2.
The calibration can be also started by using gcode G666.