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Revision to Bed levelling using multiple independent Z motors

David Crocker

 
If your bed is not perfectly flat or the gantry sags a little when the head is over the middle of the bed, the process will cause a small shift in the Z=0 position. To correct this, if you are using the Z probe to do Z homing, you can just re-home Z at the end of your bed.g file.
 
== Recommendations ==
 
* If you have 3 or 4 Z motors, in bed.g use at least one probe point close to each leadscrew.
* If you have just 2 Z motors, one at each end of the X axis, then set the Y coordinates of the leadscrews in the M671 command to be equal (the value doesn't matter, so you can use zero). Use at least two probe points, one at each end of the X axis, and with equal Y coordinates at or near the middle of the printable range.
 
== Example ==

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