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    Too much layer shifting

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    • dvmourikundefined
      dvmourik
      last edited by

      Strange enough i uploaded on my testprinter 1.16beta10 and first test was ok. Not the speeds that i used to but ok in printing. Anything changed on stepper/motion part?

      Bigger and bigger… sky is the limit.

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      • dc42undefined
        dc42 administrators
        last edited by

        Nothing changed in the stepper motor driver code in either 1.15 or 1.16. There was a bug fix to pressure advance in 1.15.

        Can you confirm that you are using the on-board stepper drivers?

        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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        • deckingmanundefined
          deckingman
          last edited by

          IMO, layer shifting is always due to some mechanical problem - especially when it's as bad as the pics in the first post. Have you checked that the pulleys are securely fixed to the motor shaft?

          Ian
          https://somei3deas.wordpress.com/
          https://www.youtube.com/@deckingman

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          • Huguesundefined
            Hugues
            last edited by

            Those shifting in first post was not due to mechanical, otherwise it will not append strictly at the same height…

            I've made few test without stepper interpolation and it seem to work better, i didn't have shifting since removing it. But this result have to be validate with real comparaison test...

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            • DjDemonDundefined
              DjDemonD
              last edited by

              It can be mechanical i.e. a print bed not properly secured so that it moves laterally my mini kossel does this as the bed mounts I made for FSR's are not clamps so the bed can shift it its not properly inserted, or electrical i.e. a motor skipping steps due to insufficient current, or being asked to move faster than it is able (i.e. insufficient current).

              Simon. Precision Piezo Z-Probe Technology
              www.precisionpiezo.co.uk
              PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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              • dvmourikundefined
                dvmourik
                last edited by

                I am using the onboard drivers in this model. Nothing hardware related because changing the board will make it print flawless.
                Sadly i was using pressure advance and this last print i removed it.

                But i don't want to hijack this thread. So we keep it to the shifting of the topic owner.

                Bigger and bigger… sky is the limit.

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                • Huguesundefined
                  Hugues
                  last edited by

                  @Djdemon i monitored the print and there was not mechanical, nothing move like bed shifting. It's more like the board forget few step

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                  • deckingmanundefined
                    deckingman
                    last edited by

                    @cubexupgrade:

                    @Djdemon i monitored the print and there was not mechanical, nothing move like bed shifting. It's more like the board forget few step

                    But it only affects one motor, hence the 45 degree angle of shift (corexy). Loose wire? Bad motor? Can you swap the XY motors and see if the shift then happens in the other direction? Looking at all the stringing at the bottom of the model, are you sure the nozzle didn't catch on a lump of plastic which either shifted something mechanically, caused the pulley to slip, or caused the motor to skip a few steps?

                    @DC42, does interpolation affect motor torque? Just wondering if there is a mechanical resistance to movement, might a motor be more likely to skip steps with interpolation enabled.

                    Ian
                    https://somei3deas.wordpress.com/
                    https://www.youtube.com/@deckingman

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                    • dc42undefined
                      dc42 administrators
                      last edited by

                      Interpolation will have only a tiny effect on motor torque. Maximum torque is produced when the motor is nearly 2 full steps behind the commanded position. A few 1/256 steps either way isn't going to make much difference.

                      @cubexupgrade, are the two motors of the same type and definitely running at the same current? If you are using M584 to remap drivers, you should specify the mappings for all axes and extruders, and set the motor currents afterwards.

                      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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                      • Huguesundefined
                        Hugues
                        last edited by

                        @dc42 motors and current are the same. I haven't use motor mapping for this printer.

                        Since i deactivate interpolation i use pressure advance function without problem even with high accl/jerk. Maybe it's just hasard.
                        I do not push test because i've to print lot of stuff for works.

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                        • Phil Maddoxundefined
                          Phil Maddox
                          last edited by

                          Hi all
                          Was this issue ever resolved ?? Im having similar problems ( 1,5 & 1.16)
                          Prusa i3 steel Cartesian . Works fine with a ramps 1.4 with TMC 2100's

                          Doesn't always happen.
                          Doesn't happen at the same height
                          When it occurs its X and Y at the same time but not by the same amount.
                          Checked all the usual suspects but as yet no real culprit to be found
                          All help / input appreciatted

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                          • Sniffleundefined
                            Sniffle
                            last edited by

                            scientifically(one test print at a time), try reducing or eliminating your pressure advance first, then lowering your accel and jerk settings to what would be a more "normal(i3)" level.

                            I eliminated my layer shifting by greatly reducing my accel and jerk settings and there has been mention of potential issues with to many steps being generated on circular moves from pressure advance that can cause steps to be lost, though i think this was also squashed or its impact reduced.

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                            • Phil Maddoxundefined
                              Phil Maddox
                              last edited by

                              Thanks ill certainly try that
                              Whats wierd is in the 2 months or so that ive been using the Duet Wifi its worked fantastically well on large and small prints alike . Just this past week or so ive had problems.
                              I'm not 100% convinced it the Duet Wifi but with all the usual suspects checked and double checked, i'm at a bit of a loss as to whats going on.
                              The only thing that has actually changed that i know of is ive upgraded to Simplfy 3D 3.1.1 but i cant really see how that would create this issue.
                              Maybe i should try another slicer to be sure.

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                              • T3P3Tonyundefined
                                T3P3Tony administrators
                                last edited by

                                Sometimes layer shifting is caused by slipping pulleys at high speed acceleration.

                                www.duet3d.com

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                                • capundefined
                                  cap
                                  last edited by

                                  one thing i noticed sorry no tech guy here but are any of the motor wires crossing are touching as this coursed me problems

                                  warning brain may explode

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                                  • Phil Maddoxundefined
                                    Phil Maddox
                                    last edited by

                                    @T3P3Tony:

                                    Sometimes layer shifting is caused by slipping pulleys at high speed acceleration.

                                    Would seem odd that both X & Y slipped at the same point in time/ the print and only once per print
                                    Already checked them and am 100% sure they are super tight.

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                                    • Phil Maddoxundefined
                                      Phil Maddox
                                      last edited by

                                      @cap:

                                      one thing i noticed sorry no tech guy here but are any of the motor wires crossing are touching as this coursed me problems

                                      Im confident the wiring is not the issue

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                                      • deckingmanundefined
                                        deckingman
                                        last edited by

                                        Here are some more possible reasons for shifted layers http://reprap.org/wiki/Shifted_layers

                                        Ian
                                        https://somei3deas.wordpress.com/
                                        https://www.youtube.com/@deckingman

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