The ZL option implements 3 point automatic bed leveling - physically leveling the bed using your Z probe and 3 independent Z steppers. This option requires a Duet Controller and a Duex2 or Duex5 expansion.
Using 3 independent Z steppers under the bed, each driving its own leadscrew, we've implemented 3 fully independent Z towers. These allow the controller to use a Z probe near each of the towers, and automatically level the bed.
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