Revision to Using the manual bed levelling assistant
|* 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.|
|* You must use the M671 command to define the X and Y coordinates of the adjusting screws. 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.|
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