Bltouch oddity

Phaedrux

M98 Pmachine_zendstop.g ; Set Z Endstop height
M98 Pmachine_zprobe.g ; Set Z Probe distance

Ok now how bout these ones so we can see what it's doing to home z?

BjornH

Promega
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Status
Processing
Tool Position
X
27.0
Y
237.3
Z
0.50
Extruder Drives
Drive 0
2861.8
Drive 1
0.0
Speeds
Requested Speed
8 mm/s
Top Speed
8 mm/s
Sensors
Vin
23.3 V
MCU Temperature
43.7 C
Fan RPM
0
Z-Probe
0
Tools
Extra
Control All
Tool Heater Current Active Standby
Nozzle
T1 - Load Filament Heater 2
active 234.9 C
235
235
Clay extruder
T2 - Load Filament n/a n/a
Bed Heater 0
active 60.1 C
60
0
Temperature Chart
System Directory
0:/sys/machine_zendstop.g
; machine_zendstop.g
; June 29, 2018

; IMPORTANT: should you drop the bed or skip a tooth, this value might change and has to be recalibrated!!!

; This file sets the Z position of the Z end stop. It is used to determine the height of the build volume.
; If this value is incorrect, you either have a nozzle that drags on the bed or is too far from the bed that
; the filament won't stick to the surface. It is the single most important file to get right so do spend
; some time verifying the Z position after making changes here.

; Instructions
; 1. Home All
; 2. Disable the bed mesh with G29 S2 twice
; 3. Run G1 X200 Y200 Z20 F1500
; 4. Manually jog the bed up using the <Z-10 to <Z-0.1 using smaller steps as you get close to the nozzle
; 5. Have bed touching the nozzle, do not leave a gap. If you can't reach the nozzle, estimate how far the
; bed is from the nozzle and add that value to the Z value in the G92 command below and start over.
; 6. Record your Z height number as shown in the DWC Machine Status Head Position Window
; 7. Calculate the new Z value for the G92 command below:
;
; If your Z value was positive, subtract the value from the current Z value in the G92 command below.
; Example: If the measured Z value of the bed touching the nozzle was 2.5 and the current Z value was
; 376.4, the new Z value would be 376.4 - 2.5 = 373.9
; Don't forget to set the Max Z value in machine_axisdimension.g to 374

; If your Z value was negative, add the value to the current Z value in the G92 command below.
; Example: If the measured Z value of the bed touching the nozzle was -0.7 and the current Z value was
; 376.4, the new Z value would be 376.4 + 0.7 = 377.1
; Don't forget to set the Max Z value in machine_axisdimension.g to 378

; If your Z value was 0, congratulations, no changes to this file are needed.

; 8. Re-enable your bed leveling compensation with G29 S1

; Set this location as Z = 376.4mm (Normally the Default Factory Number for Compound)
;G92 Z376.6 ; With glass bed and Compound

endstop should be disabled

; machine_probe.g
; June 29, 2018

; This document tells the printer which Z probe to use and what the offsets of that probe are.
; For X and Y offset, use a caliper and measure the distance between the center of the nozzle
; and the part of the probe that measures the bed.
; If the probe is to the right of the nozzle, the X value is positive
; If the probe is to the left of the nozzle, the X value is negative
; If the probe is behind the nozzle, the Y value is positive
; If the probe is in front of the nozzle, the Y value is negative

; To select which probe to use, comment / uncomment ONE of the two M558 lines below.

; Determine the Probe Z Offset:
; 1. Heat the bed to 60C and the nozzle to 150C
; 2. Move the head near the center with G1 X200 Y200
; 3. Move the bed near the nozzle with G1 Z20
; 4. Disable the bed mesh with G29 S2, do this twice
; 5. Move the bed in small steps so it just touches the nozzle, 1mm steps first, then 0.1mm steps
; 6. Set the Z0 position with G92 Z0
; 7. Move the bed back to Z20, with G1 Z20
; 8. Deploy the probe if necessary
; 9. Get the Z Probe value with G30 S-1
; 10. Note the Z value in the Web UI and update it in the G31 Z parameter below
; 11. Put the Z probe away if necessary

; Toggle by uncommenting, depending on preference
; M558 P1 X0 Y0 Z1 H5 F120 T5000 ; Set Z probe type -- Enable IR_PROBE
; M558 P4 I1 X0 Y0 Z1 H5 F100 T5000 ; Set Z probe type -- Enable LIMIT SWITCH
M558 P9 H5 F100 T2000

; Remember to update your Z-probe offset with the Z parameter below
; Follow this guide or the instructions above: http://promega.printm3d.com/books/user-manual/page/bed-leveling-probing#bkmrk-the-limit-switch-pro
; G31 P450 X30.4 Y30.7 Z10 ; Set Z probe (IR) trigger value and offset
; G31 P999 X-42 Y31 Z15.0 ; Set Z probe (Metrol switch) trigger value, offset
G31 P9 X30 Y-5 Z3.6 ; Set Z probe (limit switch) trigger value, offset

BjornH

I have yet cleaned up all the files from M3D yet, as i have been strugling just to get this piece to work correctly. Bltouch to work optimal will be last piece

Phaedrux

I can't see anything in there that should cause the bltouch to stop, but it's a bit hard to follow.

For troubleshooting I would suggest generating a basic config using the web configurator and see if you can get it working with a basic config. If it works, then you know it was a config problem. If it still has the same problem then it's a BLtouch hardware problem. Either the probe itself or the wiring.

BjornH

Thank you for looking into it, i will clean up the files and try the configurator.

BjornH

Update to those who may have the same problem.

I can now confirm this is a wiring problem, as the dupont connection/wire is very bad.

After several tries and then squeezing the cable more onto the bltouch it suddenly worked fine again.

Veti

@BjornH
yes as i said earlier, the extension wire is causing a lot of headaches.

BjornH

@Veti I will swap out all, but i think the main problem is in the dupont connector itself, i will open it and tighten the connectors.

Veti

just swap to a different connector.

these are the ones i use for small wires

https://de.aliexpress.com/item/32856368582.html

TampaPrinter

I have a CR10 that does this too. Once in a while, like every 20 prints or so the bltouch simply checks out and goes on vacation for the initial home. Gives a message about already triggered but the Duet isn’t bothered by probe issues...it drives the Z into the bed until I stop it. Never fails during the 81 probe mesh, just the initial home. I’ve changed the BLTouch, swapped a new wire to the daughterboard then ditched it altogether and ran a new wire all the way to the Duet. Still does it with the same seldom frequency.

Though I have changed all of it, I get that it could still be a BLTouch issue or a wiring issue and have nothing to do with the Duet but the firmware should halt the Z when it knows the probe has failed. I find it odd that it doesn’t, though it is entirely possible I just haven’t found how to make it do so yet.

BjornH

@TampaPrinter I have not corrected my fault yet, since i have to dissasemble my extruder. I belive the problem lays in the pins (dupont) connection to the bltouch as they are not thight enough

3dML

@TampaPrinter

Though I have changed all of it, I get that it could still be a BLTouch issue or a wiring issue and have nothing to do with the Duet but the firmware should halt the Z when it knows the probe has failed. I find it odd that it doesn’t, though it is entirely possible I just haven’t found how to make it do so yet.

You can check for BLTouch sensor error before probing to detect some errors.

if sensors.probes[0].value[0]!=1000 ; if probe is not in error state
	M291 P"BLTouch ready to use" S1 T2
        G30