Hey Steve, hey all,
I don’t know where the stock Onefinity g-code in the ‘tool-change’ field of SETTINGS page comes from (you know, the code before the modification, that is unusable and let the users stuck with no possibility to change the bit or to probe), but two things are not understandable:
-
What means the comment “probe to minimum z soft limit, which is -10”? This makes no sense. I would remove this comment.
-
There is a G91 (set incremental distance mode) lacking before the G38.2 probing command. It should be there since otherwise you probe towards an absolute position (relative to the new probed workpiece zero of Z axis though)
Can you try this (insert a G91 before the G38.2 probe command) and tell me if it works like expected now, with G38.2 Z-10 and G38.2 Z-100? I can’t test it since I have only the Onefinity Controller here, but no machine attached to it 
(which means as long as I don’t probe, the machine thinks the steppers move according to the commands, that’s what “open loop” steppers mean 
)
In the ‘tool-change’ field of SETTINGS page, please replace
G38.2 Z-10.0
G92 Z15.4
G0 Z30
with
G91 G38.2 Z-10.0
G92 Z15.4
G0 Z30
(the Z-10 and the Z30 can, of course, additionally both still accomodated to your needs)