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BLTouch Probe Won't Deploy

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  • undefined
    fcwilt @Charlie
    last edited by fcwilt 12 Sept 2021, 18:38 9 Dec 2021, 18:36

    @charlie said in BLTouch Probe Won't Deploy:

    That seems to contradict the statement made in the M280 GCode Dictionary

    Is there something that I am not considering?

    No, the docs are simply confusing things by using two different terms (servo index, port number) for the same thing.

    It not unusual to find the docs are a bit wonky in certain regards.

    As to the other question regards the M280 working it as been explained by another poster.

    Frederick

    Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

    undefined 1 Reply Last reply 9 Dec 2021, 22:57 Reply Quote 0
    • undefined
      Phaedrux Moderator @Charlie
      last edited by 9 Dec 2021, 19:53

      @charlie said in BLTouch Probe Won't Deploy:

      you must create a GPIO port using M950. Then in the M280 command, the P parameter is the GPIO port number

      Is that confusing? You must create a port number with M950 and then M280 uses that port number. What do you suggest to make it more clear?

      It even shows examples

      https://duet3d.dozuki.com/Wiki/M280

      Z-Bot CoreXY Build | Thingiverse Profile

      undefined 1 Reply Last reply 10 Dec 2021, 03:24 Reply Quote 0
      • undefined
        Charlie @JoergS5
        last edited by 9 Dec 2021, 22:45

        @joergs5
        Thank you for your response. That's good to know. I changed the deployprobe0.g file to

        M280 P0 S10 ; Set servo position.
        ; P (Servo index): 0.io4.out (Mainboard, io4.out).
        ; S (Servo angle): 10.

        anyway, to avoid making the same mistake that I made between the GPIO port number and logical pin number.

        The issue persists with this modification.

        1 Reply Last reply Reply Quote 0
        • undefined
          Charlie @fcwilt
          last edited by 9 Dec 2021, 22:57

          @fcwilt
          Okay, that explains why the M280 command worked even though I messed up the P value.

          With that said, Im still having issues deploying the BLTouch probe when homing the Z axis. The M280 P0 S10 and M401 commands successfully deploy the probe.

          undefined 1 Reply Last reply 9 Dec 2021, 23:55 Reply Quote 0
          • undefined
            JoergS5 @Charlie
            last edited by JoergS5 12 Oct 2021, 00:09 9 Dec 2021, 23:55

            @charlie one issue in your config.g is, that the speeds are very low:

            M203 S1 X300.00 Y300.00 Z15.00 E20.00

            S1 does not exist for M203, so the speeds are mm/min, so e.g. Z is only 0.25 mm/s. So your probing might run into a timeout. Please use higher values. I would take the values of the documentation of M203: https://duet3d.dozuki.com/Wiki/M203

            BUT: does Voron has a specific firmware, where S1 is valid? Then the firmware could be a reason for your problem, but I don't know how to help then. Which tool did you use to create the config file? Marlin and Slic3rPR use mm/s, but RRF use mm/min.

            undefined 1 Reply Last reply 10 Dec 2021, 00:10 Reply Quote 0
            • undefined
              Charlie @JoergS5
              last edited by 10 Dec 2021, 00:10

              @joergs5
              I assumed based on Duet3D Changelog: RepRapFirmware 3.3

              "The M203 command now supports an optional S1 parameter which changes the units to mm/sec. The default is still mm/min."

              The X, Y, and Z homing speeds appear to be the same speed as I had before the change to S1. The probe just doesnt deploy during the Z homing step.

              undefined undefined 4 Replies Last reply 10 Dec 2021, 00:12 Reply Quote 0
              • undefined
                JoergS5 @Charlie
                last edited by 10 Dec 2021, 00:12

                @charlie then sorry, it is not in the documentation yet.

                I proceed searching for a possible reason...

                1 Reply Last reply Reply Quote 0
                • undefined
                  JoergS5 @Charlie
                  last edited by 10 Dec 2021, 00:14

                  @charlie homing is often made by homeall.g, can you please post it, and homex.g and homey.g also?

                  How do you home Z: individually X, Y, Z or together in one step?

                  undefined 2 Replies Last reply 10 Dec 2021, 00:42 Reply Quote 1
                  • undefined
                    fcwilt @Charlie
                    last edited by 10 Dec 2021, 00:20

                    @charlie said in BLTouch Probe Won't Deploy:

                    The X, Y, and Z homing speeds appear to be the same speed as I had before the change to S1. The probe just doesnt deploy during the Z homing step.

                    There are parameters to M558 to control probing speeds (travel and probing) including the ability to specify two probing speeds.

                    As another poster has mentioned you didn't post homeall.g which may well be why we didn't spot the problem.

                    Frederick

                    Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                    1 Reply Last reply Reply Quote 0
                    • undefined
                      Charlie @JoergS5
                      last edited by 10 Dec 2021, 00:42

                      @joergs5

                      No worries. I greatly appreciate your willingness to help!

                      In this case, I am homing X, then Y, then Z. With that said, the issue also occurs using the "Home All" button in DWC.

                      undefined 1 Reply Last reply 10 Dec 2021, 00:45 Reply Quote 0
                      • undefined
                        fcwilt @Charlie
                        last edited by 10 Dec 2021, 00:45

                        @charlie said in BLTouch Probe Won't Deploy:

                        @joergs5

                        No worries. I greatly appreciate your willingness to help!

                        In this case, I am homing X, then Y, then Z. With that said, the issue also occurs using the "Home All" button in DWC.

                        So homing just Z with the DWC Home Z button does not work? Just want to be sure I understand what is happening.

                        Frederick

                        Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                        undefined 1 Reply Last reply 10 Dec 2021, 00:47 Reply Quote 0
                        • undefined
                          Charlie @JoergS5
                          last edited by 10 Dec 2021, 00:45

                          @joergs5

                          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).
                          1 Reply Last reply Reply Quote 0
                          • undefined
                            JoergS5 @Charlie
                            last edited by 10 Dec 2021, 00:46

                            @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.

                            undefined 1 Reply Last reply 10 Dec 2021, 01:14 Reply Quote 0
                            • undefined
                              Charlie @fcwilt
                              last edited by 10 Dec 2021, 00:47

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

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

                              undefined undefined 2 Replies Last reply 10 Dec 2021, 00:50 Reply Quote 0
                              • undefined
                                fcwilt @Charlie
                                last edited by 10 Dec 2021, 00:50

                                @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

                                Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                                undefined 1 Reply Last reply 10 Dec 2021, 01:12 Reply Quote 0
                                • undefined
                                  JoergS5 @Charlie
                                  last edited by 10 Dec 2021, 01:03

                                  @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.

                                  undefined 1 Reply Last reply 10 Dec 2021, 01:41 Reply Quote 0
                                  • undefined
                                    Charlie @fcwilt
                                    last edited by 10 Dec 2021, 01:12

                                    @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.

                                    undefined 1 Reply Last reply 10 Dec 2021, 01:24 Reply Quote 0
                                    • undefined
                                      Charlie @JoergS5
                                      last edited by 10 Dec 2021, 01:14

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

                                      1 Reply Last reply Reply Quote 0
                                      • undefined
                                        fcwilt @Charlie
                                        last edited by 10 Dec 2021, 01:24

                                        @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

                                        Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                                        undefined 1 Reply Last reply 10 Dec 2021, 01:33 Reply Quote 0
                                        • undefined
                                          Charlie @fcwilt
                                          last edited by 10 Dec 2021, 01:33

                                          @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.

                                          undefined 1 Reply Last reply 10 Dec 2021, 01:43 Reply Quote 0
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