I am sorry that I also do not understand this. I, too, am coming from smoothie. In the past, I would do a g32 with a microswitch. It would check for bed level at some unknown height above the bed. Then I would remove the microswitch, lower the nozzle til just touching the paper, G92 Z0 and M500. boom.
With this, I have been trying for over an hour. I did the autocalibration with the microswitch on. And then I removed the microswitch. Z0 results in the nozzle sitting 18.64mm above the bed.
I tried to follow this:
I use M208 S1 Z-20 to allow the nozzle to move down.
I use G Z-18.64 to lower nozzle to piece of paper (that works)
then I have tried changing this in the config:
G31 P600 X11 Y0 Z0 ; Set Z probe trigger value, offset and trigger height
G31 P600 X11 Y0 Z18.64 ; Set Z probe trigger value, offset and trigger height
but still when Z0 the nozzle is at 18.64mm above bed.
I've deleted the last few lines from the config-override and then lowered nozzle to bed, used g92 Z0 then M500, reopened config-override:
G31 T1 P500 X0.0 Y0.0 Z0.70
G31 T3 P500 X0.0 Y0.0 Z0.70
G31 T4 P600 X11.0 Y0.0 Z18.64
How do I convince my machine that it needs to be 18.64mm lower?
I decided to go into config-override and I changed this line:
M665 L304.170 R151.502 H241.959 B125.0 X0.025 Y0.027 Z0.000 ;
M665 L304.170 R151.502 H260.599 B125.0 X0.025 Y0.027 Z0.000 ;new-H260.599 old-H241.959
basically, I told the machine that it was 18.64mm taller than it calibrated at. That seems to work. but what is the correct way?