Nozzle crashes before print starts.

Phaedrux

@ajcraig99 said in Nozzle crashes before print starts.:

G29
Error: Z probe already triggered before probing move started

Do you have a deployprobe.g and retractprobe.g in the sys folder? What is in them?

ajcraig99

No delploy or retract files in my directory from what I can see.

I fixed homez.g but found I would get the same false trigger error unless I added a 1 sec delay before G30 if I had an XY travel before G30, If the nozzle was already in the XY position and didn't have to travel, it would work without the delay.

So it seems I am getting false readings from the Piezo as a mechanical issue caused by XY movement?

the same happens with G29, if it's already in the first XY position, it will do the first probe, move to the second and then false trigger the moment it goes to probe.

I have the precision piezo orion which only has one adjustment pot which I will continue to play with but can I force a P500 delay before any probing move in G29 or is that a bit hacky?

Working homez.g

; homez.g
; called to home the Z axis
G91                        ; relative positioning
G1 Z5 F6000 S2             ; lift Z relative to current position
G1 X50 Y50                 ; Move to probe pos
G4 P1000                   ; Wait 1 second
G30                        ; Probe Z

Non working homez.g

; homez.g
; called to home the Z axis
    G91                        ; relative positioning
    G1 Z5 F6000 S2             ; lift Z relative to current position
    G1 X50 Y50                 ; Move to probe pos
    G30                        ; Probe Z

Phaedrux

You can try adding an R value to your M558 command to add a pause before probing starts. Try M558 R1 to add one second delay.

https://duet3d.dozuki.com/Wiki/GCode#Section_M558_Set_Z_probe_type

ajcraig99

Awesome, making progress! Thanks to @dc42 the 5mm plunge should be fixed and thanks to @Phaedrux the Piezo seems to be working properly now. I will try another test print and report back.

I am hoping it can compensate for the sag in my bed.

ajcraig99

Success! Thankyou so much for everyones help!

Now I move onto print settings.

Phaedrux

Awesome!