BLTouch Probe Won't Deploy

Charlie

homex.g

; Voron.
; 0:/sys/homex.g
; Called to home the X axis via G28 X.
; 2020/10/24/20:00

G91               ; Set axes (not extruders) to relative positioning mode.
G1 H2 Z5 F6000    ; Lift Z relative to current position.
G1 H1 X355 F6000  ; Move quickly to X endstop (1 of 2 passes).
G1 H0 X-3 F6000   ; Move away from X endstop.
G1 H1 X10 F360    ; Move slowly to X axis endstop once more (2 of 2 passes).
G1 H2 Z-5 F6000   ; Lower Z relative to current position.
G90               ; Set axes (not extruders) to absolute positioning mode.

homey.g

; Voron
; 0:/sys/homey.g
; Called to home the Y axis via G28 Y.
; 2020/10/24/20:01

G91               ; Set axes (not extruders) to relative positioning mode.
G1 H2 Z5 F6000    ; Lift Z relative to current position.
G1 H1 Y360 F6000  ; Move quickly to Y endstop (1 of 2 passes).
G1 H0 Y-3 F6000   ; Move away from Y endstop.
G1 H1 Y10 F360    ; Move slowly to X axis endstop once more (2 of 2 passes).
G1 H2 Z-5 F6000   ; Lower Z relative to current position.
G90               ; Set axes (not extruders) to absolute positioning mode.

homeall.g

; Voron.
; 0:/sys/homeall.g
; Called to home all axes via G28.
; 2020/10/24/21:00

G91                    ; Set axes (not extruders) to relative positioning mode.
G1 H2 Z5 F6000         ; Lift Z relative to current position.
G1 H1 X355 Y360 F6000  ; Move quickly to X or Y axis endstop and stop there.
G1 H1 X355 F6000       ; Move quickly to X endstop and stop there.
G1 H1 Y360 F6000       ; Move quickly to Y endstop and stop there.
G1 H0 X-3 Y-3 F6000    ; Move away from X and Y endstops.
G1 H1 X10 F360         ; Move slowly to X endstop once more.
G1 H1 Y10 F360         ; Move slowly to Y endstop once more.
G90                    ; Set axes (not extruders) to absolute positioning mode.
G1 X175 Y151.5 F6000   ; Move X and Y axes so the Z probe is at the center of the bed.
M558 F600 H2 A1        ; Set Z probe. Feed rate: 600 mm/min. Dive height: 2 mm. Times to probe: 1.
G30                    ; Z probe quickly (1 of 2 passes).
M558 F120 H5 A1        ; Set Z probe. Feed rate: 120 mm/min. Dive height: 5 mm. Times to probe: 1.
G30                    ; Home Z by probing the bed slowly (2 of 2 passes).

JoergS5

@charlie you may need to exchange the order or M950 and M558:

in the M950 documentation https://duet3d.dozuki.com/Wiki/M950 :
"M950 must come before any commands that refer to the device being created."
So M950, then M558 which uses the servo part of BLTouch.

I am not sure about this. In the examples I know, M950 is first, M558 next, but the two commands don't have a reference to each other. But it's worth a try. M558 may expect to know the M950 values.

Charlie

@fcwilt
That is correct. Homing just Z doesnt work.

It also doesnt work if I use "Home All".

fcwilt

@charlie said in BLTouch Probe Won't Deploy:

@fcwilt
That is correct. Homing just Z doesnt work.

It also doesnt work if I use "Home All".

OK let's take the homing code out of the picture.

Can you reset the printer and successfully home X and Y?

Frederick

JoergS5

@charlie a last additional idea: M208 has Z minimum 0 and the BLTouch starts at 3 mm height. It may be that it cannot probe below 0 because of M208. This was changed in 3.4 somewhere if I remember correct, but if you use 3.3 firmware, it may be a try to set the M208 Z limit below 0.

Charlie

@fcwilt
Im assuming that "reset" means sending an M999 command, or powering off the duet. In that case, X and Y works wonderfully when I home them individually. Furthermore, the X and Y portions of the Home All function work as intended as well.

Charlie

@joergs5
Unfortunately, this did not fix the issue. I appreciate the attempt though!

fcwilt

@charlie said in BLTouch Probe Won't Deploy:

@fcwilt
Im assuming that "reset" means sending an M999 command, or powering off the duet. In that case, X and Y works wonderfully when I home them individually. Furthermore, the X and Y portions of the Home All function work as intended as well.

Great.

So with X and Y homed:

move X and Y to center of the bed either by jogging or issuing G1 commands
issue a G92 Z3 to force Z to be marked as homed (this allows jogging Z)
jog Z to 3 mm off the bed (now the logical and physical Z positions are in sync)
change to the DWC Console page
issue a G30

Post what happens.

Frederick

Charlie

@fcwilt
So I did this, but with one exception. I didnt jog the z to be 3mm off the bed, as I was concerned about crashing the nozzle.

The probe did not deploy, and the error: "Error: Probe was not triggered during probing move" was displayed on the console.

Charlie

@joergs5 said in BLTouch Probe Won't Deploy:

@charlie a last additional idea: M208 has Z minimum 0 and the BLTouch starts at 3 mm height. It may be that it cannot probe below 0 because of M208. This was changed in 3.4 somewhere if I remember correct, but if you use 3.3 firmware, it may be a try to set the M208 Z limit below 0.

Something odd happened that may help those smarter than I!

I issued an M208 S1 Z-100 command in the DWC console (which is along the lines of what I believed you asked me to do). I then issued a G30 command. Please keep in mind that this was after I did what @fcwilt asked, which was to issue a G92 Z3 command.

The print head seemed to move down around 3mm, and then the probe deployed.

fcwilt

I made a post but came back to find your new post.

I need to think.

fcwilt

@charlie

OK what are your current probe configuration commands (M950 M558 G31)?

Frederick

Charlie

@fcwilt
Here is the current Z Probe section of the config.g file, containing the M950, M558, and G31.

; Z Probe

M558 K0 P9 F120 H3 R0 T6000 A1 B0 C"0.io4.in"  ; Set Z probe type.
                                               ; K (Z probe number): 0 (1).
                                               ; P (Z Probe type): 9 (BLTouch probe).
                                               ; F (Feed rate. Probing speed [mm/min]): 120.
                                               ; H (Dive height [mm]): 3.
                                               ; R (Recovery time [seconds]): 0.
                                               ; T (Travel speed [mm/min]): 6,000.
                                               ; A (Max number of times to probe each point): 1.
                                               ; B (Heaters): 0 (Leave all heaters on while probing).
                                               ; C (Endstop input): 0. (Mainboard) io4.in.

M950 S0 C"0.io4.out"                           ; Create GPIO/servo pin.
                                               ; S (Output/servo pin number): 0.
                                               ; C (Pin name): 0. (Mainboard) io4.out.

G31 P500 X0 Y22.0 Z3.105 K0                    ; Set Z probe.
                                               ; P (Trigger value): 500.
                                               ; X (Probe X offset [mm]): 0.
                                               ; Y (Probe Y offset [mm]): 22.000.
                                               ; Z (Probe Z offset [mm]): 3.105 (This is modified for Z probe calibration. A higher offset number moves the nozzle closer to the bed.).
                                               ; K (Z probe number): 0.

M557 X25:325 Y25:313.5 P3                      ; Define Z probe mesh grid (This is the probe point grid, not the nozzle grid).
                                               ; X (Min:Max X coordinates to probe [mm]): 35 (Min) : 325 (Max).
                                               ; Y (Min:Max Y coordinates to probe [mm]): 25 (Min) : 313.5 (Max).
                                               ; P (Points to probe in each direction): 3.

fcwilt

@charlie

Thanks.

Let's changes things just a bit:

M950 S0 C"0.io4.out"
M558 P9 C"0.io4.in" H3 T6000 F120 A1 R0.2 B0
G31 P25 X0 Y22.0 Z3.105

Reset and try what I suggested before BUT lets use G92 Z7 instead of G92 Z3

Frederick

Charlie

@fcwilt
Same problem. Probe did not deploy. Same error: "Error: Probe was not triggered during probing move"

fcwilt

@charlie said in BLTouch Probe Won't Deploy:

Same problem. Probe did not deploy. Same error: "Error: Probe was not triggered during probing move"

And yet when you issued the M208 S1 Z-100 and then the G30 it seemed to work?

Frederick

Charlie

@fcwilt
This is correct, but I cant seem to replicate the scenario in which it worked.

fcwilt

@charlie said in BLTouch Probe Won't Deploy:

@fcwilt
This is correct, but I cant seem to replicate the scenario in which it worked.

Well we are overlooking something simple.

Did you post what the DWC Z Probe readout value is?

Frederick

Charlie

@fcwilt
Z Probe readout value is 0, and remains 0 for the entire homing attempt.

Charlie

Im unsure as to whether this means anything, but the BLTouch light remains a solid red when the machine is idle, as well as before and during the homing process. Of course the light shuts off when I power off the machine to prevent crashing, but the probe also deploys when power is turned off while the Z probe is occuring.