Auto_Bed_Leveling: Enhanced G29 command

[brucehvn]

As for the Z lowering before extending the probe, I have it set to raise 13mm before homing Z, so I assume that if the printer knows Z is higher than 13mm, it will lower to that point then extend the probe. I think it was doing this because the printer was left on between homing runs. If I turn the printer off and back on, and home again, it will raise then extend the probe. Likewise, if Z is below 13mm, it will raise to that point then extend the probe.

Hmm, that's not the way it works for me. I have my raise before homing set to 10mm and it always goes up 10mm no matter where it started from.