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    Mesh calibration not working or what am I doing wrong?

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    • Depundefined
      Dep
      last edited by

      But part of the model in the photo falls into several calibration points. Why are they not aligned?

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      • Vetiundefined
        Veti
        last edited by

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

        The maximum number of points is 121

        https://duet3d.dozuki.com/Wiki/Using_mesh_bed_compensation

        There is a firmware-dependent limit on the number of 441 probe points allowed.

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        • Depundefined
          Dep
          last edited by

          I have a 0.8.5 board. And when i try to make more than 121 points, it gives an error.

          But even with this number of points. They overlap the model. Why is it not calibrated.

          I think there is some kind of limit on the calibration height.

          I have spent many days and can not solve this problem.
          There is no technical possibility to make a flat table on such sizes.

          I don’t know what to do next. 😞

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          • Vetiundefined
            Veti
            last edited by

            what firmware version are you using?

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            • Depundefined
              Dep
              last edited by

              Duet 0.85
              RepRapFirmware for Duet 1.25RC4 (2019-10-19b1)

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              • Depundefined
                Dep
                last edited by

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

                M557 X500:1000 Y150:600 S10

                03.11.2019, 14:40:36 M557 X500:1000 Y150:600 S10
                Error: M557: bad grid definition: Too many grid points; suggest increase spacing to 47.4mm

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                • Vetiundefined
                  Veti
                  last edited by

                  try decreasing the mesh area and see if the result improves, allowing more probing points in a smaller area.

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                  • Depundefined
                    Dep
                    last edited by

                    I tried to reduce to 20mm. That helped. But now I don’t know, maybe I came across a flat section of the table?

                    But I need the printer to work on a large table. I don’t understand what the problem is.

                    Why calibration is not working? There may be some kind of configuration problem.

                    After all, in theory, for firmware it does not matter how uneven the bed is.

                    Either there are limitations in the firmware, or maybe the adjustment is not accurate and it is not visible at small values. But it becomes noticeable with a large roughness.

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

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

                      I tried to reduce to 20mm. That helped. But now I don’t know, maybe I came across a flat section of the table?

                      look at the mesh calibration image to check.

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                      • Depundefined
                        Dep
                        last edited by

                        If you mean to look at the program code, then unfortunately I am not good at programming.

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                        • Vetiundefined
                          Veti
                          last edited by

                          no the image of the you see after running mesh bed compensation.

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                          • fcwiltundefined
                            fcwilt
                            last edited by

                            Hi,

                            Have you ever defined a probing grid that covers the entire bed?

                            If not would you do that, probe the bed and post the height map here?

                            Thanks.

                            Frederick

                            Printers: A FT-5 with the 713 upgrade bits, a custom MarkForged style, a small Utilmaker style, a small CoreXY from kit and a E3D MS/TC setup. Various hotends. Using Duets (2 and 3) running 3.4.6

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

                              Made a calibration with the parameters: M557 X500:700 Y150:230 S20

                              RepRapFirmware height map file v2 generated at 2019-11-03 18:06, min error -0.633, max error -0.047, mean -0.346, deviation 0.137
xmin,xmax,ymin,ymax,radius,xspacing,yspacing,xnum,ynum
500.00,700.00,150.00,230.00,-1.00,20.00,20.00,11,5
 -0.329, -0.318, -0.282, -0.248, -0.238, -0.218, -0.195, -0.176, -0.133, -0.089, -0.047
 -0.377, -0.358, -0.342, -0.314, -0.324, -0.287, -0.280, -0.235, -0.199, -0.162, -0.118
 -0.484, -0.434, -0.434, -0.435, -0.375, -0.344, -0.337, -0.308, -0.259, -0.216, -0.163
 -0.541, -0.507, -0.491, -0.479, -0.467, -0.427, -0.433, -0.389, -0.338, -0.282, -0.226
 -0.633, -0.607, -0.580, -0.550, -0.533, -0.510, -0.484, -0.463, -0.407, -0.353, -0.298

                              2019-11-03_18-12-24.png

                              I still can’t understand what this can give us? 🙂

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                              • Depundefined
                                Dep @fcwilt
                                last edited by

                                @fcwilt Bed Size X1380 Y1210
                                I only calibrate 500 x 500

                                But the part fits in this size. It is inside a calibrated space.

                                Do you think if not the entire bed is calibrated this can cause an error? But how to do that? Maybe reduce the table and set offsets?

                                fcwiltundefined 1 Reply Last reply Reply Quote 0
                                • fcwiltundefined
                                  fcwilt @Dep
                                  last edited by

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

                                  @fcwilt Bed Size X1380 Y1210
                                  I only calibrate 500 x 500

                                  But the part fits in this size. It is inside a calibrated space.

                                  Do you think if not the entire bed is calibrated this can cause an error? But how to do that? Maybe reduce the table and set offsets?

                                  One height map you posted was absolutely terrible.

                                  I just want to get picture of the entire bed as a reference.

                                  Not having the entire bed calibrated shouldn't cause an error unless you try to print outside that area.

                                  But there is not much point in having a large bed if you cannot use it all.

                                  Thanks.

                                  Frederick

                                  Printers: A FT-5 with the 713 upgrade bits, a custom MarkForged style, a small Utilmaker style, a small CoreXY from kit and a E3D MS/TC setup. Various hotends. Using Duets (2 and 3) running 3.4.6

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

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

                                    One height map you posted was absolutely terrible.
                                    I just want to get picture of the entire bed as a reference.
                                    Not having the entire bed calibrated shouldn't cause an error unless you try to print outside that area.
                                    But there is not much point in having a large bed if you cannot use it all.

                                    Now I can’t make a height map of the whole table, because glass 650 x 650 mm is fixed on the table

                                    Yes, the bed is very crooked. But why doesn't compensation work? Does it really matter how rough the bed is?

                                    Vetiundefined fcwiltundefined 2 Replies Last reply Reply Quote 0
                                    • Vetiundefined
                                      Veti @Dep
                                      last edited by

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

                                      Does it really matter how rough the bed is?

                                      with a bed as uneven as that it does.
                                      the points in beetween probing are calculated and dont reflect what is actually there.
                                      so if the bed is not uniformly uneven it will be off.
                                      with it beeing off by an entire layer means this error can be significant.

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                                      • Depundefined
                                        Dep
                                        last edited by

                                        Yes, I agree, but the table is made of 4mm glass. It cannot be a “spasmodic” curve. I hope I wrote correctly 🙂

                                        Those. the glass of course bends around the table, but these are smooth bends.

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                                        • fcwiltundefined
                                          fcwilt @Dep
                                          last edited by

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

                                          Now I can’t make a height map of the whole table, because glass 650 x 650 mm is fixed on the table

                                          Yes, the bed is very crooked. But why doesn't compensation work? Does it really matter how rough the bed is?

                                          I see. Have you probed the glass area? Have you posted the height map here?

                                          If you are limited to 121 points its going to be hard to get an accurate picture of that area

                                          Probe a 220 by 220 area in the center of the glass and post the height map please.

                                          Frederick

                                          Printers: A FT-5 with the 713 upgrade bits, a custom MarkForged style, a small Utilmaker style, a small CoreXY from kit and a E3D MS/TC setup. Various hotends. Using Duets (2 and 3) running 3.4.6

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                                          • Depundefined
                                            Dep
                                            last edited by

                                            Ok, did it:

                                            RepRapFirmware height map file v2 generated at 2019-11-03 19:31, min error -1.658, max error -0.124, mean -0.815, deviation 0.349
xmin,xmax,ymin,ymax,radius,xspacing,yspacing,xnum,ynum
600.00,800.00,300.00,500.00,-1.00,20.00,20.00,11,11
 -0.817, -0.773, -0.734, -0.627, -0.614, -0.546, -0.462, -0.402, -0.332, -0.225, -0.124
 -0.884, -0.839, -0.803, -0.752, -0.669, -0.608, -0.543, -0.447, -0.357, -0.249, -0.197
 -0.951, -0.911, -0.876, -0.794, -0.727, -0.650, -0.593, -0.466, -0.392, -0.303, -0.221
 -1.018, -0.982, -0.927, -0.866, -0.784, -0.719, -0.652, -0.532, -0.477, -0.361, -0.230
 -1.112, -1.084, -1.003, -0.936, -0.846, -0.780, -0.662, -0.569, -0.475, -0.394, -0.303
 -1.191, -1.137, -1.079, -1.004, -0.908, -0.821, -0.727, -0.628, -0.552, -0.449, -0.337
 -1.293, -1.210, -1.157, -1.087, -1.000, -0.896, -0.788, -0.681, -0.595, -0.441, -0.354
 -1.398, -1.303, -1.233, -1.160, -1.062, -0.968, -0.864, -0.753, -0.645, -0.521, -0.419
 -1.490, -1.404, -1.323, -1.231, -1.137, -1.033, -0.924, -0.789, -0.704, -0.581, -0.453
 -1.544, -1.474, -1.409, -1.314, -1.201, -1.101, -0.995, -0.886, -0.752, -0.614, -0.506
 -1.658, -1.574, -1.497, -1.390, -1.277, -1.162, -1.050, -0.925, -0.774, -0.658, -0.533

                                            Offset down because the table is not heated now

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