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Too much layer shifting

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  • undefined
    dvmourik
    last edited by 29 Oct 2016, 09:16

    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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    • undefined
      dc42 administrators
      last edited by 29 Oct 2016, 10:15

      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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      • undefined
        deckingman
        last edited by 29 Oct 2016, 10:28

        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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        • undefined
          Hugues
          last edited by 29 Oct 2016, 10:56

          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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          • undefined
            DjDemonD
            last edited by 29 Oct 2016, 11:14

            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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            • undefined
              dvmourik
              last edited by 29 Oct 2016, 11:17

              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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              • undefined
                Hugues
                last edited by 29 Oct 2016, 12:10

                @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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                • undefined
                  deckingman
                  last edited by 29 Oct 2016, 14:20

                  @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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                  • undefined
                    dc42 administrators
                    last edited by 29 Oct 2016, 14:32

                    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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                    • undefined
                      Hugues
                      last edited by 30 Oct 2016, 07:28

                      @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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                      • undefined
                        Phil Maddox
                        last edited by 25 Nov 2016, 02:34

                        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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                        • undefined
                          Sniffle
                          last edited by 25 Nov 2016, 02:52

                          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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                          • undefined
                            Phil Maddox
                            last edited by 25 Nov 2016, 06:24

                            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 25 Nov 2016, 12:46

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

                              www.duet3d.com

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                              • undefined
                                cap
                                last edited by 25 Nov 2016, 13:50

                                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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                                • undefined
                                  Phil Maddox
                                  last edited by 26 Nov 2016, 11:46

                                  @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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                                  • undefined
                                    Phil Maddox
                                    last edited by 26 Nov 2016, 11:47

                                    @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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                                    • undefined
                                      deckingman
                                      last edited by 26 Nov 2016, 12:46

                                      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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