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Revision to Using mesh bed compensation


Mesh bed compensation works like this:
+* On power up no mesh bed compensation is in use, unless you have G29 S1 in config.g
* You define a grid using the M557 command. Normally you do this in config.g.
* You run G29 S0 (or just G29) to probe the bed at the mesh points. If probing is successful, the bed height map is saved in a file on the SD card and is or can be displayed in Duet Web Control.

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