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    Solved BLTouch Not Probing Multiple Times

    Duet Hardware and wiring
    bltouch probe
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    • IOIIOOO
      IOIIOOO last edited by

      I am using the following for my BLTouch:

      M558 P9 H3 F120 R0.2 T6000 A5 B1 ; Set Z probe type to bltouch and the dive height + speeds

      My understanding is that the A5 means it should probe up to 5 times or until two results repeat, but whenever I probe it just does one and then moves on. Am I misunderstanding something about how this is supposed to work?

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      • Phaedrux
        Phaedrux Moderator last edited by

        It should probe at least twice.

        Where have you set that M558 command?

        If you send M558 P9 in the console, what does it echo back?

        How are you telling it to probe? In a homing file? Issuing a G30 in the console?

        Try adding an S parameter to set a tighter tolerance. Try S0.003

        Z-Bot CoreXY Build | Thingiverse Profile

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        • dc42
          dc42 administrators last edited by

          Which firmware version are you using?

          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

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          • IOIIOOO
            IOIIOOO last edited by

            I found it. Researching the answers for @Phaedrux , I realized I was resetting M558 in my homeall.g file which was overriding my M558 from config.g.

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            • ICY_SNAKE
              ICY_SNAKE last edited by

              Hello,

              have the same Probem,

              if I set A to any value it always probes only twice.

              M558 P9 C"^zprobe.in" H5 F120 T18000 A4 R0.7 S0.003

              using 3.3 version.

              my next problem is that after the calibration the heightmap always looks identical.

              I have different Alu beds and glass beds. but all of them look close. That can´t be.
              Also if I rotate them the drop stays always at the same back corner. Thats not possible!

              Whats wrong from ym side ?

              Thx
              Dieter

              DO IT OR DON'T

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              • dc42
                dc42 administrators last edited by

                @icy_snake said in BLTouch Not Probing Multiple Times:

                I have different Alu beds and glass beds. but all of them look close. That can´t be.
                Also if I rotate them the drop stays always at the same back corner. Thats not possible!

                It is possible, if the beds are flat but the gantry height varies with XY position. I test bed probing by deliberately putting a thin item (e.g. a microscope slide, or thin piece of plastic) on part of the bed.

                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

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