Having the M206 command (home offset) returning its status
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The M206 can be used to do 'baby stepping', but as it don't return its status, it is difficult to handle it.
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You can do the same thing with G10 P0 Z### to set up a Z offset, and G10 P0 to show the current offset. However, any change you make won't take effect until all moves alrready in the queue have been completed.