Autoleveller

Well I've not even probed anything yet, only tried a 'simulation'.

The line:
G31 Z-10 F100

causes Mach3 to keep lowering the tool position indefinitely - er well I stopped it at -70mm.

I assume that Z should go to -10mm and then stop. Is that correct, or could there be a Mach3 setting or other problem causing this?

You are correct, The machine should stop at Z-10 when probing so I have no idea why its going further (some setting in mach 3 to override this?)

Unless the probe depth setting has been changed by you, the default is -1mm. So the line should be What version of AL are you using?

I actually think the defaults are ok, the Z-10 was the very first probe. The subsequent depths are -1.

Anyway it does not really matter since the actual probe operation seems to work fine, though so far have only probed and not routed. I really think v0.8 or greater is needed (presently on 0.7.4) since there are 4 distinct g-code files which need levelling. As understood the version I've got cannot do that.