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    Mesh bed levelling - probe twice?

    Tuning and tweaking
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    • kia
      kia last edited by

      Hello everyone,

      I am running a Prusa style printer with a genuine BLTouch for a while and for a few weeks with the Duet wifi.

      I was wondering if it is somehow possible to probe every point while mesh bed levelling twice or three times and save the average value of every single probing point for the hight map to compensate for z-probe inaccuracies.

      Didn't find anything in the documentation or the forums about that. Sorry if I overlooked something.

      Kia

      zapta 1 Reply Last reply Reply Quote 0
      • Veti
        Veti last edited by

        https://duet3d.dozuki.com/Wiki/Gcode#Section_M558_Set_Z_probe_type

        Annn Maximum number of times to probe each point, default 1
        Snnn Tolerance when probing multiple times, default 0.03mm

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        • kia
          kia last edited by

          Thanks a lot! totally missed that.
          So I simply add A and S to my config.g, right? Does the sequence matter?
          in my case i think it would be: M558 P9 H5 F120 T6000 A3 S0.03

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

            the sequence does not matter.

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            • kia
              kia last edited by

              Thank veti!

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              • Phaedrux
                Phaedrux Moderator @kia last edited by

                @kia said in Mesh bed levelling - probe twice?:

                M558 P9 H5 F120 T6000 A3 S0.03

                S0.03 is the default already, so to make it more stringent, decrease that value. For my BLTouch I use 0.003 for instance.

                A3 may be a bit low for that level of stringency, so maybe bump it up to 5 or more. Usually 2 probes at each point is enough, but occasionally it will take 4 or 5.

                Z-Bot CoreXY Build | Thingiverse Profile

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                • zapta
                  zapta @kia last edited by

                  @kia said in Mesh bed levelling - probe twice?:

                  probe every point while mesh bed levelling twice or three times and save the average value

                  From the documentation, it will average the first two consecutive probes that have similar readings. That is, no general average of N readings.

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

                    @zapta said in Mesh bed levelling - probe twice?:

                    From the documentation, it will average the first two consecutive probes that have similar readings. That is, no general average of N readings.

                    Recent firmware versions will do N readings and average them all if you set the tolerance negative.

                    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

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

                      @dc42 said in Mesh bed levelling - probe twice?:

                      Recent firmware versions will do N readings and average them all if you set the tolerance negative.

                      I missed that part. Thanks.

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