BLTouch G30 troubles

peter247

Doing a long print now so I can't check , I know that G30 s-1 as worked for me in the past , but not sure if I was on 3.1.1 at the time.

MartinNYHC

I'm still looking for a (working) possibility to auto set Z offset. I'm always struggeling with a wrong offset and this is very annoying.

droftarts

@MartinNYHC said in BLTouch G30 troubles:

M558 P9 C"^io7.in" R0.5 H5 F300 T3000

Remove the '^' to enable the pullup resistor. Because, as @dc42 says here https://forum.duet3d.com/post/179301

All Duet 3 ioX.in ports have permanent pullup resistors, on the main board and on expansion boards. So you never need to use ^ in the name. We recommend that you do not, because enabling it reduces the noise margin.

F300 is quite fast for BLTouch probing, so it's possible that it's knocking the pin back in too hard. Try experimenting with the feed rate to see if that helps.

Not sure why it would have an issue with G30 S-1, but not with other probing, with either of the above.

Ian

MartinNYHC

Enabled pullup resistor and changed to F100. Same problem.

Veti

check your wiring. the cables that come with the bltouch are notoriously bad.

you should never see 1000 in the webui when using a bltouch.

MartinNYHC

Already checked the cables and they are good. Remember that the BLTouch is onky having problems with G30 S-1 and NOT with homing, bed and leadsrew probing. Very strange.

peter247

@MartinNYHC

I'm still looking for a (working) possibility to auto set Z offset.

That is the point of the bltouch that if you change the beds height it will compensate.
But you still need to set the distance between the nozzle to the bed unless to have a metallic bed and nozzle a test a short or a physical switch with nozzle contact .

Phaedrux

Can you send M98 P"config.g" and report any errors?

How exactly are you going through the G30 S-1 process?

https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe

I use a macro to help automate the process, see here:

M291 P"Grid bed compensation map and Z Probe trigger height will be cleared. Ok or Cancel?" R"WARNING" S3 ; User must click OK or cancel.
M291 P"Heights will be found in gcode console if logging successful gcode is enabled" R"Did you remember to enabled gcode logging?" S3

; Clear compensation map and Z probe trigger height
;
G28			; home all axis
M561			; Disable any current bed compensation
G90			; Absolute positioning
T0			; Activate first tool
M98 P"ZSpeedsSlow.g"	; Set lower speeds for Z homing and lower Z motor current
M913 Z50		; Drop motor current to prevent damage in case of head crash

; Preheat to probing temps
;
M291 P"Preheating to bed to 60 and nozzle to 210 for accurate probing"
M104 S210		; Set nozzle to 210 and release
M190 S60		; Set bed to 60 and wait
M109 S210		; Set nozzle to 210 and wait

M98 P"0:/macros/musical tunes/GetAttention.g"

; 1
;
M291 P"Nozzle will now move to center of bed to reset Z0 and calibrate probe" S3
M98 P"0:/macros/Calibration/Bed Leveling/1_Center Nozzle on Bed"
G90 G1 Z3 F400
M400
G92 Z4 			; Reset z to 8 to allow jogging up to touch bed to nozzle
M291 P"Jog the Z Axis until the bed and nozzle are touching and click OK" R"Setting Z=0" Z1 S3
M400
G92 Z0			; Set z = 0
G90 G1 Z3 F400
M104 S0 		; Turn off hotend heater as it's no longer needed
M291 P"Probe will now move to center of bed and measure trigger height 10 times" R"ZProbe Trigger Height Calibration" T3
M400
M98 P"0:/macros/Calibration/Bed Leveling/1_Center Probe on Bed"

G1 Z5
M400
G30 S-1
M400
G1 Z5
M400
G30 S-1
M400
G1 Z5
M400
G30 S-1
M400
G1 Z5
M400
G30 S-1
M400
G1 Z5
M400
G30 S-1
M400
G1 Z5
M400
G30 S-1
M400
G1 Z5
M400
G30 S-1
M400
G1 Z5
M400
G30 S-1
M400
G1 Z5
M400
G30 S-1
M400
G1 Z5
M400
G30 S-3 ; measure probe height and set it.
M400
M500 P31 ; save trigger height to config-override.g
G1 Z5

M98 P"0:/macros/musical tunes/GetAttention.g"

; Turn off heaters
; 
M104 S0		; Set nozzle to 0 and release
M140 S0		; Set bed to 0 and release
M98 P"ZSpeedsNormal.g"	; return to normal speeds
M98 P"CurrentsNormal.g"
M400
M291 P"Homing"
G28		; Home Z
M84 ; turn off the motors
M291 P"Probing complete. Turning off heaters and homing axis. Check log for trigger heights and enter into config.g" S2

MartinNYHC

@Phaedrux There are no erros when doing a M98 P"config.g". The interesting thing is, that you macro works without any error Don't ask me why. Will do some tests to see how it goes. Thanks for sharing your macro!

MartinNYHC

@Phaedrux Thanks again! for your macro. It does exactly what I was looking for and is going to be part of my new workflow

Phaedrux

@MartinNYHC I'm glad it worked out for you. It calls some macros to move to positions and set some values, so you may want to edit it to use your specific values.

MartinNYHC

@Phaedrux said in BLTouch G30 troubles:

@MartinNYHC I'm glad it worked out for you. It calls some macros to move to positions and set some values, so you may want to edit it to use your specific values.

Already changed it to my needs