Some interesting results this morning… I used CM to restore back to “default” XXL config, home’d it. Then if I pull up MDI and send /G38.2 Z.-5 F1 it runs homing backwards. If I send it G38.2 Z.-5 F1 (presumably flowing through CM’s magic now, lacking the /) it works as I’d expect it to and probes downward.
Looking at the logs, when I drop the preceeding slash, it actually sends “G38.2Z-29.225” to GRBL and entering this command WITH a / results in the correct behavior.
My conclusion here is that 1: I’m not quite smart enough, and 2: this must have to do with work offsets. Anybody think they can shed some light on the why here?