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Hi!
I struggled for a couple of days with the Z callibration on the Orion but have now determined the correct procedure after reading the Rostock documentation (Rostock MAX Assembly Guide).
Here is what I believe to be the correct procedure:

• 1. Preheat the nozzle and bed to your material's settings
  2. Move the nozzle down using the manual setting on the LCD menu to get the correct spacing between the nozzle and the bed
  3. Set Z=0 on the LCD menu
  3. Home Towers
  4. Read the printer Height from the Repetier console and copy the number
  5. Under the Repetier Config menu, open Firmware EEPROM Configuration and set the Z height using this number
  6. Send M500 g=code to the printer to save this value to the EEPROM
  7. Under the Repetier Config menu, open Printer Setting and set the same number on the Printable Height field under the Printer Shape tab <<< missing step!

When I turn the printer off and on again, whatever its position it will say that its at Z=0. Homing the towers will take them up and retrieve the correct height from the EEPROM.

Ready to print!

#6 isn't required. This happens when you click the ok button on the EEPROM table display.

The z height setting is clearly outlined and the _only_ step I would add to that is adding the max z height value to Repetier-Host.

When you set z=0 in the LCD menu, THAT writes the proper data to the EEPROM table.

g.

As Gene said, nothing after #3 is required.....

Thanks for your replies. I understand that setting the z calibration on the LCD menu should save the printer height to the EEPROM, but everytime i did it it would return a seemingly random number that was normally much larger than the truth. Eventually the procedure above worked but I may well be missing something..

In anycase the rostock assembly guide is a pretty good read!!