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    Strange salmon skin - Moire effect on my Delta

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    • totalitarianundefined
      totalitarian
      last edited by

      Some more examples

      0_1558937800114_cb32e311-95a7-46cd-aeaa-1300823af6fc-image.png

      0_1558937823995_5a2c05bb-6ddc-4697-b5c4-d82fc5be8036-image.png

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      • dc42undefined
        dc42 administrators
        last edited by

        What layer height are you printing at? Try making the layer height an exact number of full steps, if you are not already, for example 0.2mm.

        What is the rated current of the tower motors and the extruder motor?

        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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        • totalitarianundefined
          totalitarian @dc42
          last edited by

          @dc42 I've tried all the 'magic' numbers, doesn't seem to make any difference

          0.0809, 0.1618, or 0.3236
          0.1294, 0.2589, 0.3883
          0.2 even 0.2589

          No idea what the rated current is, the motors have no markings on them 😞

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          • totalitarianundefined
            totalitarian
            last edited by

            I would guess standard 1.5A

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            • dc42undefined
              dc42 administrators
              last edited by

              If you change the extrusion width (or, if it is a vase-mode print, you could just change the extrusion factor in DWC) while keeping the layer height constant, does the angle of the banding change? If so, that suggests an extruder issue.

              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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              • totalitarianundefined
                totalitarian
                last edited by totalitarian

                Left is 0.4, right is 0.8 width. I had a brainwave and converted it from a flying extruder to a full bowden. Unfornately it didn't make a blind bit of notice 😞

                0_1558986458693_0fd9714d-6668-4630-9695-5362cacee565-image.png

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                • dc42undefined
                  dc42 administrators
                  last edited by

                  What is the vertical spacing between the diagonal bands?

                  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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                  • totalitarianundefined
                    totalitarian
                    last edited by

                    Bit tricky to tell but they look around 4mm

                    0_1559045718146_2108427a-4333-452e-b9d0-02ca8a02a805-image.png

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                    • dc42undefined
                      dc42 administrators
                      last edited by

                      I was wondering whether it was related to the tooth pitch on the belts, which I presume is 2mm.

                      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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                      • totalitarianundefined
                        totalitarian @dc42
                        last edited by

                        @dc42 If that was the case, would that indicate an issue with the belts or the toothed pulley?

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                        • dc42undefined
                          dc42 administrators @totalitarian
                          last edited by

                          @totalitarian said in Strange salmon skin - Moire effect on my Delta:

                          @dc42 If that was the case, would that indicate an issue with the belts or the toothed pulley?

                          Yes, or perhaps with the toothed side of the belts running over non-toothed idlers. But I would expect the vertical pitch of the banding to be 2mm, not 4mm

                          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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                          • totalitarianundefined
                            totalitarian
                            last edited by

                            Such a shame as otherwise it is a very well put together machine.

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                            • Vetiundefined
                              Veti
                              last edited by

                              @totalitarian said in Strange salmon skin - Moire effect on my Delta:

                              I would guess standard 1.5A

                              measure the resistance of a phase. that will give some indication as to what kind of motors they are.

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                              • bondusundefined
                                bondus
                                last edited by

                                It looks like typical delta waves on your printed parts. Bent diagonal patterns on flat surfaces. That's a sign that something is not perfect with the linear motion. It could be the pulleys, idler, linear bearings, ...
                                The bend in your patterns is not very sharp, the predator is a very large machine. A smaller machine will get sharper bends. If you move the model to the edge of the platform the angles should change, and the patterns will get tighter or more spread out depending on what/which towers is the cause.

                                When it is motor/driver related you usually get a tight, highly repetitive patterns. If you turn off microstepping it will show up very clearly. That's not a suggestion to solve your problem, but a fun experiment to see what it looks like 🙂

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                                • totalitarianundefined
                                  totalitarian @bondus
                                  last edited by

                                  @bondus Thanks, i'll certainly give that a try. Do you not suspect the rods at all?

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                                  • bondusundefined
                                    bondus
                                    last edited by

                                    @totalitarian, I don't know how play in the arms looks like in prints. But I suspect it would not leave nice patterns. Who knows, deltas are complex machines.

                                    It's easy to check for play of the ball joints, just wiggle the arms, any click-clock sounds are bad. Rumour says that if you have play in those small joints you can gently squeeze them on the edge in a vice or with some pliers to increase the preload.

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