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    Strange delta calibration and mesh compensation

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    • taconiteundefined
      taconite @taconite
      last edited by

      @T3P3Tony and if I do a mesh bed compensation with the last values it looks like this:
      5f144968-ecb1-4ace-8c5f-44455f75d9e3-image.png

      Custom ANET A8
      Custom Delta: D-PATCH (Delta Printer with Automatic Tool CHanging) https://forum.duet3d.com/topic/16082/d-patch?_=1596131234754

      All I do here is under this license: CC BY-NC-SA

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      • T3P3Tonyundefined
        T3P3Tony administrators @taconite
        last edited by

        @taconite by the end its was getting there but still not fully converged, maybe try 8 runs, you don't need to send M665 and M666 between runs. I notice you have quite large H values in the G30 commands, did you measure all 17 of those accurately?

        in 6 factor calibration the radius is adjusted as part of the calibration (note this is not the same as your bed radius) so manually adjusting it and then running G32 will cause G32 to be out for a few runs until it adjusts it back to what the calibration is measuring it as.

        If after running G32 a number of times and then doing a mesh compensation you are still getting the bowl shape in mesh bed levelling then try temporarily dropping the number of points to 7 (6 in a ring around the outside of the bed, 3 in front of each tower and 3 roughly between the towers, and 1 in the center).

        www.duet3d.com

        taconiteundefined T3P3Tonyundefined 3 Replies Last reply Reply Quote 0
        • taconiteundefined
          taconite @T3P3Tony
          last edited by

          @t3p3tony
          Okay. Yeah the M666 and M665 commands where just for reference. Yes I measured them with the section "Measuring the trigger height" in the wiki https://duet3d.dozuki.com/Wiki/Calibrating_a_delta_printer. Should I remove the H values?

          Yes as I understand the delta radius is this and as it is hard to measure in reality I took it from CAD.

          6468fb72-1361-4fc0-9047-863836795b86-image.png

          Okay I will try some more runs and see what happens

          Custom ANET A8
          Custom Delta: D-PATCH (Delta Printer with Automatic Tool CHanging) https://forum.duet3d.com/topic/16082/d-patch?_=1596131234754

          All I do here is under this license: CC BY-NC-SA

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          • T3P3Tonyundefined
            T3P3Tony administrators @taconite
            last edited by

            @taconite said in Strange delta calibration and mesh compensation:

            Should I remove the H values?

            not if they are required. (i.e. if the probe trigger height relative to the nozzle varies across the bed.

            www.duet3d.com

            taconiteundefined 1 Reply Last reply Reply Quote 0
            • taconiteundefined
              taconite @T3P3Tony
              last edited by

              @t3p3tony

              so yeah nothing helped

              1. deleted the trigger heights from bed
              2. ran 13 cycles with 6-factor on 17 points
              3. ran 7 cycles with 7-factor on 17 points

              Still the same result as the delta radius is adjusted

              Any other ideas?

              Custom ANET A8
              Custom Delta: D-PATCH (Delta Printer with Automatic Tool CHanging) https://forum.duet3d.com/topic/16082/d-patch?_=1596131234754

              All I do here is under this license: CC BY-NC-SA

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              • T3P3Tonyundefined
                T3P3Tony administrators @T3P3Tony
                last edited by

                @t3p3tony said in Strange delta calibration and mesh compensation:

                If after running G32 a number of times and then doing a mesh compensation you are still getting the bowl shape in mesh bed levelling then try temporarily dropping the number of points to 7 (6 in a ring around the outside of the bed, 3 in front of each tower and 3 roughly between the towers, and 1 in the center).

                please try that.

                www.duet3d.com

                T3P3Tonyundefined 1 Reply Last reply Reply Quote 0
                • taconiteundefined
                  taconite @T3P3Tony
                  last edited by

                  @t3p3tony

                  yeah but what if the measured trigger height result in bad parameters from the beginning?

                  Custom ANET A8
                  Custom Delta: D-PATCH (Delta Printer with Automatic Tool CHanging) https://forum.duet3d.com/topic/16082/d-patch?_=1596131234754

                  All I do here is under this license: CC BY-NC-SA

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                  • T3P3Tonyundefined
                    T3P3Tony administrators @T3P3Tony
                    last edited by

                    @taconite also, for now, the radius being adjusted is not necessarily wrong as maybe some element of the model you are using to determine the theoretical radius is off

                    www.duet3d.com

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                    • taconiteundefined
                      taconite @T3P3Tony
                      last edited by

                      @t3p3tony
                      Tried 7 iterations with just 7 points

                      M665 L414.000:414.000:414.000 R235.772 H464.295 B150.0 X0.033 Y-0.455 Z0.000
                      M666 X0.028 Y-0.064 Z0.037 A0.00 B0.00

                      deviation is a lot higher than with more points
                      Calibrated 6 factors using 7 points, (mean, deviation) before (-0.006, 0.235) after (-0.000, 0.235)

                      before that it was more in this direction
                      Calibrated 6 factors using 17 points, (mean, deviation) before (0.000, 0.088) after (0.000, 0.088)

                      44790918-be6a-4819-b97e-17a6329c082b-image.png

                      Custom ANET A8
                      Custom Delta: D-PATCH (Delta Printer with Automatic Tool CHanging) https://forum.duet3d.com/topic/16082/d-patch?_=1596131234754

                      All I do here is under this license: CC BY-NC-SA

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                      • T3P3Tonyundefined
                        T3P3Tony administrators @taconite
                        last edited by

                        @taconite said in Strange delta calibration and mesh compensation:

                        Where are the images you are displaying coming from? I assumed you were plotting the heightmap.csv externally for some reason but now not so sure.

                        From the documentation you linked earlier it looks like your rod length could be a cause.

                        www.duet3d.com

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                        • taconiteundefined
                          taconite
                          last edited by

                          I use this page to view the mesh because I am getting the maximum deviation
                          http://lokspace.eu/3d-printer-auto-bed-leveling-mesh-visualizer/

                          But 7 Factor was not working as well and I tried to manipulate it manually and it did not improve.

                          Custom ANET A8
                          Custom Delta: D-PATCH (Delta Printer with Automatic Tool CHanging) https://forum.duet3d.com/topic/16082/d-patch?_=1596131234754

                          All I do here is under this license: CC BY-NC-SA

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                          • T3P3Tonyundefined
                            T3P3Tony administrators @taconite
                            last edited by

                            @taconite ahh i see. ok so try shortening the rod lengths with 6 factor and 7 probe points until you get a flatter bed shape.

                            www.duet3d.com

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                            • taconiteundefined
                              taconite
                              last edited by

                              @t3p3tony
                              Isn't that super tedious? In which intervals should I change the rod length? It should not be off by mm

                              Custom ANET A8
                              Custom Delta: D-PATCH (Delta Printer with Automatic Tool CHanging) https://forum.duet3d.com/topic/16082/d-patch?_=1596131234754

                              All I do here is under this license: CC BY-NC-SA

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                              • dc42undefined
                                dc42 administrators @taconite
                                last edited by

                                @taconite I suspect a problem with your Z probe and/or the joints of your printer. What type of Z probe are you using, and what sort of joints?

                                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

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

                                  @dc42 thank you for your reply

                                  Z-Probe: inductive sensor, M18, similar to what I was using on other printers
                                  Joints: They are Ball-joints, Igus, KCRM-05 they have a little play which I compensated with springs

                                  EDIT: the nozzle is replaced by the sensor so it sits at X0 Y0

                                  Custom ANET A8
                                  Custom Delta: D-PATCH (Delta Printer with Automatic Tool CHanging) https://forum.duet3d.com/topic/16082/d-patch?_=1596131234754

                                  All I do here is under this license: CC BY-NC-SA

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                                  • taconiteundefined
                                    taconite @taconite
                                    last edited by

                                    no it gets really strange. I decreased the size of the probing radius (calibration and mesh compensation) and with the "original" values I get this L414 R236

                                    Calibrated 6 factors using 7 points, (mean, deviation) before (-0.000, 0.006) after (0.000, 0.005)

                                    M665 L414.000:414.000:414.000 R238.041 H465.172 B150.0 X0.146 Y0.015 Z0.000
                                    M666 X-0.003 Y-0.210 Z0.214 A0.00 B0.00

                                    6f5b6943-b19a-406b-8e5d-52936fd60d53-image.png

                                    Custom ANET A8
                                    Custom Delta: D-PATCH (Delta Printer with Automatic Tool CHanging) https://forum.duet3d.com/topic/16082/d-patch?_=1596131234754

                                    All I do here is under this license: CC BY-NC-SA

                                    T3P3Tonyundefined 1 Reply Last reply Reply Quote 1
                                    • T3P3Tonyundefined
                                      T3P3Tony administrators @taconite
                                      last edited by

                                      @taconite ahh ok so if you probe too close to the edge of the delta radius then that may cause issues, (the arms are almost straight down or straight out).

                                      You are now getting much better results, and can see if you get much improvement with 17 points over 7. I have a slightly smaller bed on my delta and use 10 points (6 outer ring, 3 in an inner ring. 1 in the center).

                                      www.duet3d.com

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