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    Weird leveling result

    Duet Hardware and wiring
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    • Nightreaver
      Nightreaver last edited by

      Hello

      I bought a new CoreXY, upgraded to a Duet2Wifi + BLTouch... and started bed leveling. (thats short version of what i did 😉 )
      Earlier I used capacitive sensor and had some weird results, so now that I have BLTouch I thought... the leveling would become better, but its not really.

      I'm leveling with 49 Points total... with around 30mm distance which think is a good count for my print bed.

      But what i am seeing doesnt make sense to me. I have and idea what it might be, but I'll be waiting for your experience opinions before doing andything else.

      Here is the picture:

      0_1557322354145_9d5042b4-0f7a-4a0a-a302-9a3f36bc2b3b-image.png

      0_1557322371162_6c8dd1af-4207-4711-a4e6-99e1bbbc8c11-image.png

      Mean error: 0.161 mm
      RMS error: 0.090 mm
      Maximum deviations: -0.081 / 0.386 mm

      Side Question: I enable the leveing on Duet Wifi still with sending "M420 S1" during start ?

      Thanks for your help

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      • Veti
        Veti last edited by

        please test your repeatability

        https://forum.duet3d.com/topic/6962/m48-measure-z-probe-repeatability-and-print-to-serial-output

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        • Nightreaver
          Nightreaver last edited by

          I used the Macro in the Thread you've posted:

          G32 bed probe heights: 0.176 0.171 0.171 0.176 0.171 0.161 0.176 0.165 0.153 0.153, mean 0.167, deviation from mean 0.009

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          • dc42
            dc42 administrators last edited by

            Are you probing with the bed heater on or off? If you are probing with it on, then you may want to try adding the B1 parameter to your M558 command, in case magnetic field from the bed heater is affecting the BLTouch.

            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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            • Nightreaver
              Nightreaver last edited by

              I'm probing with cold bed all the time and with

              M558 P9 H5 R0.3 F120 T2000 A10 B1
              G31 P30 X5 Y54 Z1.5

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              • Veti
                Veti last edited by

                what is your bed and surface?

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                • jaurand
                  jaurand last edited by

                  I have something similar on my bed leveling. My coreXY has wheels, and I was told that the wheels get a slight flat spot on them. I'm guessing it is a flat spot on the wheels that you are seeing the rise and fall. Working on upgrading to linear rails

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

                    The bed is 4 point aluminium, with an 12V MK3 heater.
                    And the surface is kind of fiberglass sheet, around 3mm thick?

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                    • Nightreaver
                      Nightreaver @jaurand last edited by

                      @jaurand The was one of my Ideas, as the pattern seem to be repeating. I will check my wheels

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