Indusctive z probe error

[Tinchus]

Hi. Im having this issue after upgrading to 3.4.1 stable . Duet 3 SBC

I have a mesh levelling routing, nothing on that start gcode has changed. As aI said the error appears sometimes in version 3.4.1 (previous version used was 3.3)

Error: Probe was not triggered during probing move

And also sometimes I get the error:

Warning: the height map has a substantial Z offset. Suggest use Z-probe to establish Z=0 datum, then re-probe the mesh.

If I let the print continues, the prints Z offset is OK, perfect.

Any ideas of what can be happening?

My start gcode is this :

G21
M83
M561 ; clear any bed transform
G28
T0
G32
G1 X5 Y5 F2000
M400
M141 S90
G10 S<MAIN1 - 70>
M116 P0 S5
G1 X175 Y175 F2000
G30; Home z again with probe for Z DATUM
G29; mesh levelling
G10 S<TEMP>
M116 P0
<MATL>

Thanks in advance

[Tinchus]

I have more data. The probing error happens when running bed.g

In that file I do a side by side calibration (both Z motors are independent).

bed.g:

M561 ; clear any bed transform
G28 ; home
G1 X182 Y204 F2000
G30
G30 P0 X10 Y204 Z-99999 ; probe near left leadscrew
G30 P1 X345 Y204 Z-99999 S2 ; probe near right leadscrew and calibrate 2 motors
M400

With version 3.3 this error was not happening. I have read documentation and I cant find anything related to a change on probing

[Stephen6309]

@tinchus Make sure you home Z before leveling, that should get rid of the warning about the Z offset.

Here's my bed.g:

; bed.g
; called to perform automatic bed compensation via G32
M561						; clear any bed transform
while iterations < #move.axes & move.axes[iterations].visible
	if !move.axes[iterations].homed
		G28
		break
G28 Z						; home Z for Z0
M290 R0 S0					;  clear baby stepping
G30 P0 X10 Y150 Z-99999		; probe near a leadscrew, half way along Y axis
G30 P1 X275 Y150 Z-99999 S2	; probe near a leadscrew and calibrate 2 motors

[fcwilt]

@tinchus said in Indusctive z probe error:

I have more data. The probing error happens when running bed.g

In that file I do a side by side calibration (both Z motors are independent).

bed.g:

M561 ; clear any bed transform
G28 ; home
G1 X182 Y204 F2000
G30
G30 P0 X10 Y204 Z-99999 ; probe near left leadscrew
G30 P1 X345 Y204 Z-99999 S2 ; probe near right leadscrew and calibrate 2 motors
M400

With version 3.3 this error was not happening. I have read documentation and I cant find anything related to a change on probing

A couple of things.

You should not need that M400.

And after leveling the bed you should reset the Z=0 Datum with a single G30 at whatever location you normally use.

Frederick

[Tinchus]

@stephen6309 Thank you for this. Can you explain me what these lines are for?

while iterations < #move.axes & move.axes[iterations].visible

if !move.axes[iterations].homed

	G28

	break

Also, lets supose the z probe is not triggered an d I get an error, can that error be detected and add some code lines to repeat the probing?

[Tinchus]

@fcwilt Thank you for the tip, will do it

[fcwilt]

@tinchus said in Indusctive z probe error:

while iterations < #move.axes & move.axes[iterations].visible

if !move.axes[iterations].homed

  G28

  break

That code scans for any un-homed axis and if it finds one it does a "home all".

I myself don't use such code because I don't won't homing to occur as a side effect. Probing, other than homing with a probe, should not be happening unless all axes are already homed.

But that's just me.

Frederick

[Stephen6309]

@tinchus To make sure the printer is homed. I also have this in start.g, so it shouldn't run in G32 during a print, but the G28 Z is in there, since the bed is heated up before running G32 and G29/mesh.g for a print. It also allows testing of the G32 without additional steps.