BLTouch Probe Won't Deploy

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.

fcwilt

@charlie said in BLTouch Probe Won't Deploy:

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.

Well it's getting late and I've got to get some sleep.

Sorry we couldn't get it sorted in this session.

I will run some tests with my BLTouch and see I can determine what conditions could be causing your problems.

Talk to you later.

Good night.

Frederick