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    Mesh calibration not working or what am I doing wrong?

    Scheduled Pinned Locked Moved Unsolved
    Tuning and tweaking
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    • Depundefined
      Dep
      last edited by

      And my heightmap.csv
      I probe only small part of the bed.

      ![26be9a25-bc8a-4ed3-bbd2-e9848fa24d1f-image.png](/assets/uploads/files/1572013335987-26be9a25-bc8a-4ed3-bbd2-e9848fa24d1f-image.png) code_text
      ```RepRapFirmware height map file v2 generated at 2019-10-25 16:42, min error -0.269, max error 0.858, mean 0.065, deviation 0.164
      xmin,xmax,ymin,ymax,radius,xspacing,yspacing,xnum,ynum
      600.00,900.00,150.00,550.00,-1.00,35.00,35.00,9,12
       -0.052, -0.109, -0.185, -0.253, -0.269, -0.265, -0.222, -0.187, -0.126
        0.080, -0.001, -0.079, -0.143, -0.171, -0.163, -0.146, -0.104, -0.076
        0.231,  0.106, -0.006, -0.067, -0.078, -0.095, -0.087, -0.062,  0.014
        0.277,  0.186,  0.061, -0.015, -0.049, -0.051, -0.047,  0.000,  0.048
        0.380,  0.271,  0.183,  0.071,  0.043,  0.056,  0.021,  0.045,  0.091
        0.426,  0.294,  0.208,  0.108,  0.075,  0.038,  0.067,  0.088,  0.122
        0.461,  0.858,  0.235,  0.124,  0.108,  0.061,  0.084,  0.102,  0.150
        0.405,  0.282,  0.193,  0.107,  0.049,  0.029,  0.080,  0.122,  0.154
        0.392,  0.270,  0.142,  0.082,  0.057,  0.030,  0.058,  0.108,  0.140
        0.316,  0.193,  0.085,  0.065,  0.018,  0.015,  0.035,  0.094,  0.139
        0.235,  0.134,  0.052, -0.003, -0.039, -0.017, -0.001,  0.094,  0.111
        0.137,  0.029, -0.031, -0.052, -0.092, -0.055,  0.010,  0.082,  0.104
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      • fcwiltundefined
        fcwilt
        last edited by

        Hi,

        Well for mesh-cal to work well you need to probe as much of the bed as you can.

        Are you currently probing at least the area you are trying to print on?

        Frederick

        Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

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        • Depundefined
          Dep
          last edited by Dep

          Yes. The model size on the photo is 150 x 30 mm. The size I am probe is 500 x 450 mm

          The size of the whole bed is 1380 x 1210 mm

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          • Vetiundefined
            Veti
            last edited by Veti

            @Dep said in Mesh calibration not working or what am I doing wrong?:

            The model size on the photo is 150 x 30 mm. The size I am probe is 500 x 450 mm

            what he means is your probing distance is 25mm.

            your bed seems to be very uneven. up to 0.6mm difference between probing points. that is a lot.

            try decreasing the probing distance.

            also check with M122 while printing that you actually are using mesh compensation.

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            • Depundefined
              Dep
              last edited by

              I tried to reduce the distance between probing points. This does not affect printing. Moreover, increasing the distance to 50 mm also gives nothing. Exactly the same effect.

              M122 I will try, thanks. But during printing, the Z axis rotates when moving along the XY axes. I think that calibration works.

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              • Depundefined
                Dep
                last edited by

                This is what baffles me:

                Mesh system works. The table moves up and down when printing.
                Bltouch has been tested on a different printer.

                Many times I ran probing with different parameters. But always the same effect. It’s like a mesh grid is rotated 180 degrees. Maybe I missed something?

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                • Vetiundefined
                  Veti
                  last edited by

                  @Dep said in Mesh calibration not working or what am I doing wrong?:

                  your probe is to the right and behind the nozzle?

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                  • Depundefined
                    Dep
                    last edited by

                    No. Probe is to the left and behind the nozzle. (Homing point on the left and front of the printer)

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                    • Depundefined
                      Dep
                      last edited by

                      2019-10-25_21-13-15.png

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                      • Vetiundefined
                        Veti
                        last edited by Veti

                        G31 P25 X27 Y-4 Z1.78 ; set probe height

                        your configuration says to the right and infront.

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                        • Depundefined
                          Dep
                          last edited by

                          Ahh. Thanks! I will try now G31 P25 X-27 Y4 Z1.78 ; set probe height

                          1 Reply Last reply Reply Quote 0
                          • Depundefined
                            Dep
                            last edited by

                            Thanks for the tip! It really helped and now even with a probing step 50mm everything is fine!

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

                              glad its sorted. can you mark the thread as solved?

                              1 Reply Last reply Reply Quote 0
                              • Depundefined
                                Dep
                                last edited by

                                No, I still can’t figure it out.

                                Yes, the table is really ragged. But what does it matter?

                                RepRapFirmware height map file v2 generated at 2019-11-01 19:53, min error -0.157, max error 1.455, mean 0.615, deviation 0.346
                                xmin,xmax,ymin,ymax,radius,xspacing,yspacing,xnum,ynum
                                450.00,950.00,120.00,620.00,-1.00,50.00,50.00,11,11
                                  0.311,  0.163,  0.054, -0.041, -0.157, -0.153, -0.096, -0.007,  0.135,  0.285,  0.481
                                  0.538,  0.388,  0.246,  0.109,  0.003,  0.019,  0.069,  0.128,  0.265,  0.423,  0.625
                                  0.749,  0.588,  0.436,  0.264,  0.150,  0.147,  0.190,  0.264,  0.378,  0.504,  0.729
                                  0.988,  0.760,  0.609,  0.402,  0.303,  0.273,  0.265,  0.342,  0.466,  0.623,  0.821
                                  1.175,  0.966,  0.754,  0.567,  0.426,  0.389,  0.408,  0.439,  0.588,  0.733,  0.941
                                  1.392,  1.108,  0.892,  0.671,  0.523,  0.485,  0.468,  0.534,  0.659,  0.795,  0.985
                                  1.455,  1.171,  0.922,  0.739,  0.558,  0.514,  0.530,  0.602,  0.694,  0.816,  1.001
                                  1.438,  1.153,  0.944,  0.734,  0.558,  0.535,  0.558,  0.613,  0.688,  0.823,  1.000
                                  1.352,  1.097,  0.919,  0.732,  0.618,  0.532,  0.606,  0.649,  0.783,  0.928,  1.065
                                  1.211,  1.003,  0.823,  0.625,  0.536,  0.518,  0.587,  0.633,  0.756,  0.955,  1.108
                                  1.086,  0.891,  0.752,  0.581,  0.519,  0.491,  0.552,  0.658,  0.813,  0.972,  1.133
                                

                                In the photo there is a fragment of a part that covers several calibration points. Why is this place not aligned?

                                Is it possible that the firmware has restrictions on the height of the table when adjusting?

                                IMG_1174.jpg
                                IMG_1175.jpg
                                IMG_1176.jpg

                                I changed the calibration settings

                                M208 X0 Y-35 Z0 S1 ; set axis minima
                                M208 X1380 Y1210 Z1500; Set axis maxima
                                
                                M557 X450:950 Y120:620 S50
                                M376 H6
                                
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                                • Vetiundefined
                                  Veti
                                  last edited by

                                  it means that your bed is very uneven. as you have 0.2 differences between probing point (an entire layer) there is only so much that the mesh can compensate for. you will need a lot smaller spacing i would imagine.

                                  can you post a picture of the mesh.

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                                  • Depundefined
                                    Dep
                                    last edited by

                                    Do you want to say that mesh calibration cannot compensate for more than 0.2mm?

                                    2019-11-03_12-47-04.png

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                                    • Vetiundefined
                                      Veti
                                      last edited by

                                      that looks absolutly terrible.

                                      i am saying that if you have 0.2 between two points the area in between is calculated, so there could be deviations to the real values.
                                      with a bed as uneven as that it is very likely that that is the case.

                                      however looking at our printer setup, it could also be a mechanical issue with your x gantry. because of the length it could be sagging and produces this result.

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                                      • Depundefined
                                        Dep
                                        last edited by

                                        All axes are calibrated and checked. Dimensions of printed part + - 0.2 mm

                                        OK. The table is very uneven. But for calibration, what does it matter?

                                        Why doesn't calibration work in this range?

                                        Is there a limitation?

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                                        • Vetiundefined
                                          Veti
                                          last edited by

                                          @Dep said in Mesh calibration not working or what am I doing wrong?:

                                          All axes are calibrated and checked. Dimensions of printed part + - 0.2 mm

                                          axis sagging has nothing to do with dimension.

                                          your x axis and y axis are over a meter long. they could bend under their own weight of the beam is not rigid enough.
                                          that would lead to an image you are seeing, where the sides are higher and the middle is low. i.e the weight in the middle is causing more deflection that on the sides.

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                                          • Depundefined
                                            Dep
                                            last edited by

                                            Yes, I understand that.

                                            But mesh calibration measures this deflection. Why is it not compensated during printing?

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