Calibrate Z Probe.

OwenD

@Titus-A-Duxass
I'm assuming that you are restarting the machine after editing the G31 value in config.g
By your config you're using a limit switch.
Try reducing the F parameter in your M558 command even further to check if it's more accurate.
You can set two speed probing like this
M558 P5 C"^io4.in" H10 F600:60 T6000

Titus A Duxass

@OwenD
I am restarting the mainboard as required after a config.g change, but I am not restarting the printer.

Titus A Duxass

@Titus-A-Duxass
At present G31 is 3.3
So having done G92 Z0, G1 Z5, G30 the toolhead returns to 0.76, I get this result repeatedly.
What I do not understand is having to enter 0.76 in the G31 line. Going from 3.3 to 0.76 is a huge change which makes no sense to me.

Titus A Duxass

@Titus-A-Duxass
At this moment the printer is unusable, uploading a print from both S3D and Cura results in the nozzle dragging across the bed.

Falcounet

@Titus-A-Duxass Did you do G92 Z0 with the nozzle touching the bed ?
I feel like you sent G92 Z0 again immediately after G30 S-1 returned its result.

Titus A Duxass

@Falcounet To be honest I cannot remember. I did find a mistake in my homez.g
G92 Z4 - I think that is incorrect and have changed to Z0.
Now when I jog down to the Z0 it stops 1.39mm above 0 and, naturally, I cannot jog below 0.

Falcounet

@Titus-A-Duxass If you use a probe, you should use G30 for homing, not G92 Zx

Titus A Duxass

@Falcounet I have both the probe and the Z endstop switch.
I want to use the switch to set the height as I feel the probe is not so accurate.

I have changed the G92 entry in homez.g to 1.4 and now when I do the procedure I get a constant 0.43 but now I get a report in the console, I have never seen a feedback report until I changed the entry in homez.g

Falcounet

@Titus-A-Duxass If you don't use G30 to home, the G31 line is useless and the Z position is set by the endstop trigger and the value you use with G92 Zx.

Titus A Duxass

@Falcounet I think I have it now. I have set the G92 entry in homez.g to the height difference between the Z endstop switch trigger point and the height of the bed (1.5mm) and now it prints - it's only taken me 6 hours to find the solution.