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    Bl-touch re-deploy after probing or z homing

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    • bugm
      bugm last edited by

      Hi
      I installed a Bl-touch clone and something wired happening.
      All seems to be fine when running the deploy, retract and self test macros.
      however when i home Z-axis or doing a mesh bed compensation - something wired happens:
      1 The probe goes to the requested coordinates
      2 deploy the pin
      3 the bed goes up toward the bl-touch sensor.
      4 after the pin tuoch the bed its auto retract.
      5 the bed starts going down
      until now all is just fine..

      After it probed the point - while the bed goes down away from
      the probe - the pin suddenly deployed again, hits the bed very fast and retracts.
      this can happen randomly, about 20% of the probed points and
      it effecting the bed mesh as red area that appears on the mesh map.
      All suggestions are welcomed 🙂

      p.s i am running the latest duetwifi 2 fw on corexy printer

      1 Reply Last reply Reply Quote 1
      • dc42
        dc42 administrators last edited by

        Update the firmware to 2.01 or 2.02RC2.

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

        1 Reply Last reply Reply Quote 0
        • BLV
          BLV last edited by BLV

          so i am not the only one who is getting this behavior
          same situation here, it deploys randomly right after probing with the 2.02rc2
          on sunday i'll get my bud touch sensor just to make sure its not a bad one.
          cables are fine, no shorts or disconnection.
          thought about adding some delay or fast dropping the bed before it will bump it.

          1 Reply Last reply Reply Quote 1
          • tjb1
            tjb1 last edited by tjb1

            I had this same issue with a BLTouch from TriangleLab. It would deploy, touch the bed, retract, and then shoot back out and retract again. It also fell down in the middle of the print several times causing it to keep catching on the print and if it didn't fall all the way it would error out. I tried rewiring it (including pulling the wires away from the stepper/heater wires) and even mode 9 with no success. I don't know if it's because it's a clone or not but I took it off and switched to piezo.

            1 Reply Last reply Reply Quote 0
            • dc42
              dc42 administrators last edited by

              This behaviour was common when using earlier firmwares, but only caused a problem if the Z travel speed of the probe after triggering was low. It was fixed in firmware 2.01. See https://github.com/dc42/RepRapFirmware/blob/dev/WHATS_NEW.md.

              Duet WiFi hardware designer and firmware engineer
              Please do not ask me for Duet support via PM or email, use the forum
              http://www.escher3d.com, https://miscsolutions.wordpress.com

              bugm 1 Reply Last reply Reply Quote 0
              • tjb1
                tjb1 last edited by

                Would this include it randomly falling in the middle of a print or is that a different issue?

                genghisnico13 dc42 2 Replies Last reply Reply Quote 0
                • genghisnico13
                  genghisnico13 @tjb1 last edited by

                  @tjb1 Perhaps you could try unscrewing the top screw (core) a little, I never experienced that issue, but maybe this helps.

                  BLV 1 Reply Last reply Reply Quote 0
                  • dc42
                    dc42 administrators @tjb1 last edited by

                    @tjb1 said in Bl-touch re-deploy after probing or z homing:

                    Would this include it randomly falling in the middle of a print or is that a different issue?

                    No, that would be a different issue.

                    Duet WiFi hardware designer and firmware engineer
                    Please do not ask me for Duet support via PM or email, use the forum
                    http://www.escher3d.com, https://miscsolutions.wordpress.com

                    1 Reply Last reply Reply Quote 0
                    • BLV
                      BLV @genghisnico13 last edited by

                      @genghisnico13 said in Bl-touch re-deploy after probing or z homing:

                      @tjb1 Perhaps you could try unscrewing the top screw (core) a little, I never experienced that issue, but maybe this helps.

                      yesterday i cleaned, magnetized and replaced the heatshrink but its still deploying randomly .

                      1 Reply Last reply Reply Quote 0
                      • bugm
                        bugm @dc42 last edited by bugm

                        @dc42 said in Bl-touch re-deploy after probing or z homing:

                        This behaviour was common when using earlier firmwares, but only caused a problem if the Z travel speed of the probe after triggering was low. It was fixed in firmware 2.01. See https://github.com/dc42/RepRapFirmware/blob/dev/WHATS_NEW.md.

                        I am running the latest 2.02RC2 version

                        @blv said in Bl-touch re-deploy after probing or z homing:

                        @genghisnico13 said in Bl-touch re-deploy after probing or z homing:

                        @tjb1 Perhaps you could try unscrewing the top screw (core) a little, I never experienced that issue, but maybe this helps.

                        yesterday i cleaned, magnetized and replaced the heatshrink but its still deploying randomly .

                        thanks,this morning i bought a shrink and replaced it too and yet it still doing it.
                        its functioning flawlessly in test mode but while probing its still deploying twice.

                        1 Reply Last reply Reply Quote 0
                        • dc42
                          dc42 administrators last edited by

                          Please run M558 and check that it reports you are using Z probe mode 9.

                          Duet WiFi hardware designer and firmware engineer
                          Please do not ask me for Duet support via PM or email, use the forum
                          http://www.escher3d.com, https://miscsolutions.wordpress.com

                          bugm BLV 2 Replies Last reply Reply Quote 1
                          • bugm
                            bugm @dc42 last edited by bugm

                            @dc42 said in Bl-touch re-deploy after probing or z homing:

                            Please run M558 and check that it reports you are using Z probe mode 9.

                            Thank you, it look s like it is on mode 9. maybe i need to try mode 5?
                            0_1539510952235_4564664646.jpg

                            edit: when trying mode 5 the pin deploy agian (twice) instead of once but the second deploy is with a 1 sec delay.

                            1 Reply Last reply Reply Quote 0
                            • BLV
                              BLV @dc42 last edited by BLV

                              @dc42 said in Bl-touch re-deploy after probing or z homing:

                              Please run M558 and check that it reports you are using Z probe mode 9.

                              I can confirm that my friend's bltouch is acting same. even changed the wiring and its beeing deployed twice - at neer 30% of the probing points.
                              2.02rc2 on mode 9 too.

                              1 Reply Last reply Reply Quote 1
                              • dc42
                                dc42 administrators last edited by dc42

                                Is this on a Duet WiFi, Ethernet, or Maestro?

                                Duet WiFi hardware designer and firmware engineer
                                Please do not ask me for Duet support via PM or email, use the forum
                                http://www.escher3d.com, https://miscsolutions.wordpress.com

                                bugm 1 Reply Last reply Reply Quote 0
                                • BLV
                                  BLV last edited by BLV

                                  Mine is a DuetWifi 2 v1.01
                                  today i played with all the M558 parameters but nothing changed this wired behavior.
                                  the Bltouch is a clone with 3.3v output (trace has been cut)

                                  1 Reply Last reply Reply Quote 0
                                  • Phaedrux
                                    Phaedrux Moderator last edited by

                                    I think it being a clone has more to do with it than anything.

                                    Have you verified the trace is cut with a multimeter?

                                    Z-Bot CoreXY Build | Thingiverse Profile

                                    BLV 1 Reply Last reply Reply Quote 0
                                    • BLV
                                      BLV @Phaedrux last edited by BLV

                                      @phaedrux said in Bl-touch re-deploy after probing or z homing:

                                      I think it being a clone has more to do with it than anything.

                                      Have you verified the trace is cut with a multimeter?

                                      I dont think so, because yeataday i installed my friend's genuine Bltouch v2.0 smart and it has the same problem.
                                      Yes, i used a microscope at work to cut the trace and verified with a fluke.

                                      Phaedrux 1 Reply Last reply Reply Quote 0
                                      • Phaedrux
                                        Phaedrux Moderator @BLV last edited by Phaedrux

                                        @blv sorry I missed that.

                                        What are using for M558?
                                        What are your movement speed settings?

                                        Z-Bot CoreXY Build | Thingiverse Profile

                                        BLV 1 Reply Last reply Reply Quote 0
                                        • BLV
                                          BLV @Phaedrux last edited by

                                          @phaedrux
                                          M307 H3 A-1 C-1 D-1
                                          M558 P9 H5 F100 T6000

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                                          • bugm
                                            bugm @dc42 last edited by bugm

                                            @dc42 said in Bl-touch re-deploy after probing or z homing:

                                            Is this on a Duet WiFi, Ethernet, or Maestro?

                                            i got the 1.01 - i erased the firmware and installed again 2.02RC2 from scratch - no difference.
                                            no idea what to do, replacing the wires made no difference.
                                            even while homing z axis alone, every 2-3 homing it keeps happening - after probing the pin deploys
                                            again while the bed moving down (core xy). it hits the glass before the bed went down, then retracts.
                                            just to check as @Blv - i installed it on my mks gen-l and it works without any issue.

                                            1 Reply Last reply Reply Quote 0
                                            • genghisnico13
                                              genghisnico13 last edited by

                                              I've been having some problems with my 3D Touch (when it probes a hot bed), so I made a video to ask for a new one, is your probe behaving different from how its seen in the video?
                                              Sorry for the background noise around the middle, the power company is making some holes.

                                              Phaedrux BLV 2 Replies Last reply Reply Quote 0
                                              • Phaedrux
                                                Phaedrux Moderator @genghisnico13 last edited by Phaedrux

                                                @genghisnico13 How do you have the probe mounted? Your video makes it look like there is a bolt right above the top of the probe and it looks like it might be right beside a stepper motor? It uses an electromagnet and could be susceptible to pieces of metal being too close to it. If you take the probe out of the mount and just suspend it in the air and trigger it by hand, does it behave the same way?

                                                Z-Bot CoreXY Build | Thingiverse Profile

                                                genghisnico13 1 Reply Last reply Reply Quote 0
                                                • BLV
                                                  BLV @genghisnico13 last edited by

                                                  @genghisnico13 said in Bl-touch re-deploy after probing or z homing:

                                                  I've been having some problems with my 3D Touch (when it probes a hot bed), so I made a video to ask for a new one, is your probe behaving different from how its seen in the video?
                                                  Sorry for the background noise around the middle, the power company is making some holes.

                                                  Its almost identical, except that in my case its deploying the pin only one time after it already probed the point. (On your video its deploying even more).

                                                  1 Reply Last reply Reply Quote 0
                                                  • genghisnico13
                                                    genghisnico13 @Phaedrux last edited by

                                                    @phaedrux You could be right, but since the seller has already agreed to send me a new one.... I'll test it in mid air when the new one arrives (couple of months). Worst case I end up with 2 working probes.
                                                    I assumed it was designed to be in close proximity to ferrous materials and put it in the only place with free space that doesn't limit movement length, could have been a bad choice, will see after testing.

                                                    1 Reply Last reply Reply Quote 0
                                                    • dc42
                                                      dc42 administrators last edited by

                                                      It's also worth remembering that high-current bed heaters can affect the trigger height of a BLTouch, although I've not heard of them causing the pin to redeploy. So if you are probing with the bed heater turned on, try turning it off, or add parameter B0 to the M558 command.

                                                      Duet WiFi hardware designer and firmware engineer
                                                      Please do not ask me for Duet support via PM or email, use the forum
                                                      http://www.escher3d.com, https://miscsolutions.wordpress.com

                                                      bugm 1 Reply Last reply Reply Quote 0
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