Bed leveling

The most frustrating aspect of the Morgan so far, must certainly be the bed levelling calibration.  My heated bed is suspended off the build platform by about an inch, and fastened using only three screws (with springs).  One in the middle up front, and one each side at the back.

I have done calibration so many times, I cannot estimate how many times.  9 points, 25 points, it seems as if calibration lasts maybe one print.  It is especially problematic on large prints like the bed arms, which prints diagonally.

I have even cancelled the levelling calibration and done manual calibration for a while.  With three screws it is not a simple task, as it is not a simple matter of lifting one corner.  The three screws interact.

At the moment I have a procedure that seems to work.  Time will tell.

1)  Home (G28).

2)  Set the Z offset (in the M206 command) at position X100 Y100 to get the nozzle to touch the bed.

3)  Home.

4)  Level the bed (M370, M371, M372 and M373, and save).

5)  Home

6)  Re-set the Z-offset at X100 Y100.

7)  Home

8)  Check the zero of the bed at X100 Y100, X50 Y150, X150 Y150, X150 Y50, and X50 Y50.

Repeat as many times as necessary, and hope the first layer of the next print will be good.