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Revision to Using mesh bed compensation

Mark Duncan

** Move the nozzle over the centre of the bed and do a single G30 probe (G30 without parameters).
** Alternatively, if the printer is a delta, run auto calibration.
-** Alternatively, if the printer has multiple independent Z leadscrews and you have set up leadscrew bed levelling, run leadscrew bed levelling.
+** Alternatively, if the printer has multiple independent Z leadscrews and you have set up leadscrew bed levelling, run leadscrew bed levelling (G32)
Note, whichever of these techniques you use, you must do exactly the same any time you want to use G29 S1 to reload the height map.

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