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    Z-probe (bltouch) releases too early when doing G29 mesh leveling

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    • Asdasd1234
      Asdasd1234 last edited by

      Hi all,

      My z-probe works fine when doing a single point homing, but when I do the mesh bed, the pin triggers at the right point, but releases nearly instantly and hits the bed before the bed has a chance to move away.

      Am I missing something?

      Thanks

      EDIT
      another question aswell… The x-y offsets on g31.. if I have y10, does that mean that when the nozzle is at y0, the probe is sitting on y10, or the other way round?

      many thanks again!

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      • dc42
        dc42 administrators last edited by

        1. I am aware that some users have this problem with the bltouch and clones. Using a higher travel speed (to increase the speed at which it moves up) works for some users. I may change the behaviour in the next firmware release.

        2. Z probe offset of Y10 means that the probe is over the bed at Y10 when the nozzle is at Y0.

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        • Asdasd1234
          Asdasd1234 last edited by

          Thanks!

          This one is a genuine bltouch now after I broke the original clone (drove it sideways and bent it off on the bed 😞 ).

          Increasing the speed isn't possible unfortunately as i'd need to increase it by 5x the amount to escape the falling pin. I have a corexy with a heavy bed so although 2x is do-able, I wont be able to outpace the sensor.

          Can I suggest maybe a "z-probe reset delay" or something where you could have the pin wait 1 second before dropping again.

          Currently, I think it's only a matter of time before the pin drops early enough that it bounces back up and fails

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          • coolice
            coolice last edited by

            Subscribed as I see the same quirk with mesh bed levelling.
            I drop the bed 40mm and then initiate the mesh levelling, which sees it get to the first point without clipping the bed.

            Ian

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