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    topic_solved New BLTouch not triggering.

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    • keith
      keith last edited by keith

      Received a new replacement Duet2Wifi board and everything is working, except for the BLTouch. I have tried two different BLTouch's and I am having the same problem with both. When homing Z the probe touches the bed, retracts, then extends again and acts like it is in error mode, while the Z continues moving down to the bed.
      M280 P3 S160 I1 resets the error mode.
      M280 P3 S120 I1 Self test works.
      M401 will extend the probe.
      M402 will retract the probe.
      It is wired as described in: https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe

      config.g; Z-Probe
      M574 Z1 S2
      M307 H3 A-1 C-1 D-1
      M558 P9 H5 F120 T6000 R0.2 Note: I've tried setting P9 to P3.
      G31 P500 X-28 Y5 Z2.1
      M557 X10:220 Y10:220 S40

      deployprobe.g
      M280 P3 S10 I1

      homeall.g
      G91
      G1 Z5 F6000 S2
      G1 S1 X-240 Y-240 F1800
      G1 X5 Y5 F6000
      G1 S1 X-240 Y-240 F360
      G90
      G1 X38 Y20 F6000
      G30

      homez.g
      G91
      G1 Z5 F6000 S2
      G90
      G1 X38 Y20 F6000
      G30

      retractprobe.g
      M280 P3 S90 I1

      What am I missing?

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

        Does the nozzle crash into the bed the second time?

        keith 1 Reply Last reply Reply Quote 0
        • keith
          keith @gtaman last edited by

          @gtaman
          Yes it does

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          • gtaman
            gtaman last edited by gtaman

            did you just switch the BL touch out without changing the wires? because I have a feeling a wire is broken and only works sometimes. And make sure you have two pins between the orange and brown connection.

            keith 1 Reply Last reply Reply Quote 1
            • keith
              keith @gtaman last edited by

              @gtaman
              Thanks gtaman
              That was mostly right. I left the meter long extension in and upon inspection, the Dupont connector on the BLTouch end of the meter long extension had a couple of broken tabs. I like that the BLTouch comes with spare Dupont connectors. Working now.

              gtaman 1 Reply Last reply Reply Quote 1
              • gtaman
                gtaman @keith last edited by gtaman

                @keith

                Haha awesome! My buddy had the same problem with his $5000 printer. He'd been calling tech support for over half a year, and their only way of solving the problem was replacing all the electronics. I came over one day, noticed it only works on some parts of the bed, and figured it was a broken wire within the same day. Depending on the position of the axis, the wire would either connect or disconnect (like flexing headphone wires after they broke). I'm glad you found the issue on your printer 🙂

                Cheers.

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