Feature suggestion: Report bed flatness
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The idea is to report also the bed flatness, regardless of how level it is. This will provide a lower bound on leveling errors and will indicate the magnitude of non adjustable mechanical errors in the system (bed, rails, etc)
The results can in similar format of the errors reported today but relative to the plane that minimize them rather than the plan z=0.
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@zapta After running a G29, then show the heightmap.csv.
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@stephen6309 , if the bed is perfectly flat but tilted, does it shows 0 flatness error?
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The plane displayed should show the tilt, yes.