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Revision to Using the manual bed levelling assistant

David Crocker

* You must have a bed or gantry that is levelled by three or four adjusting screws. Three screws is best, although on a very large bed four screws may be needed.
* Your Z probe must be correctly defined and calibrated in the M558 and G31 commands in config.g. If you have no Z probe then use M558 P0 to indicate you will manually adjust the nozzle down to the bed (using the paper feeler test or similar).
* You must use the M671 command to define the X and Y coordinates of the adjusting screws. These coordinates will usually be outside the normal printable area defined by M208. The M671 command must come after any M667 or M669 command in config.g.
* You must use the M671 command to define the X and Y coordinates of the adjusting screws. These coordinates will usually be outside the normal printable area defined by M208. The M671 command must come after any M667 or M669 command in config.g.
* You must set up a bed.g file in the usual way with at least as many probe points as adjusting screws. As a minimum, you should have one probe point close to each adjusting screw. You can have more probe points if you wish. For example, with a square bed you might choose to probe close to each corner even if you have just 3 bed levelling screws.
* The value of the S parameter on the final G30 command in bed.g must equal the number of adjusting screws.

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