Need help! please! Duet2wifi and bltouch ZOffset

chriskimbr

No matter what value i put in the config.g after the steps below
-it doesn't move the nozzle on print closer to the bed. wtf.-

-Config files-
config.g
homez.g

-Steps taken to calibrate offset-
Home All
m851 ;z0 reset settings
m500
m501
m503
g28 z
g1 f60 z0 ;moves to true z0
G92 Z5 ;changes offset by 5 so we can move nozzle/bed
;manually move nozzle with paper e.g -0.93
g92 zo ; set z0 to new point
G1 Z10 ;move nozzle/bed away from nozzle/bed by 10
g30 s-1 ;find new offset read off terminal
m851 z0.95
m500
m501
m503
;enter the offset value in config.g on line e.g. ;G31 P25 X-20 Y-45 Z-0.93 ; Set Z probe trigger value, offset and trigger height
Home all
g1 f60 z0 ;check z0 see if its touching bed.

PaulHew

I am assuming you have read this guide?
https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe

I had major issues with my BL Touch and others kindly helped me out and eventually was able to resolve the issue.

These are my notes from my post. I am running a Maestro board so I think the P64 needs to be changed to your relevant board.

"Yes i did follow it to the letter.
At point 6. I actually manually deployed the probe using M280 P64 S10 from the 'Connecting Z-Probe' guide THEN used G30 S-1
I think this is where I have gone wrong as G30 S-1 also deploys the probe."

dc42

The sequence you list looks like a mixture of what you might use for Martlin and what you use for RRF. In particular, you are setting the trigger height to -0.95 in your M851 command and then storing it to config-override.g, which will override your settings in config.g. I suggest you open config-override.g in the system files editor, remove any G31 lines you find there, and save the file. Then use the procedure in the link that @PaulHew posted above.

chriskimbr

@dc42 that was it! Thank you!
G31 line was in the override file. Its printing closer to bed now.

Question: on the duet2wifi if i change the config.g g31 zvalue and save it.
Do i need to reboot device to take effect?

Phaedrux

@chriskimbr said in Need help! please! Duet2wifi and bltouch ZOffset:

Question: on the duet2wifi if i change the config.g g31 zvalue and save it.
Do i need to reboot device to take effect?

Yes. It will prompt you to restart the board for it to take effect.

If you wanted to configure it on the fly, you could send the command in the console and it would take effect immediately without a restart.