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Problem printing circles

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Tuning and tweaking
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  • undefined
    Phaedrux Moderator @OBELIKS
    last edited by 17 Jul 2018, 21:18

    @obeliks The profile in the gcode you posted has thin walls enabled. And I've shown I can duplicate getting slic3r to generate the odd extrusion amounts by toggling it along with setting the wall thickness.

    Z-Bot CoreXY Build | Thingiverse Profile

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    • undefined
      OBELIKS
      last edited by 17 Jul 2018, 21:38

      Oh, you are right. Sorry about that. I will test tomorrow.
      But that should not trigger on normal perimeters as are on the picture a couple of posts above.

      P3Steel Toolson mk2 - Duet 2 WiFi --> RatRig V-Core with Duet WiFi 1.03
      Original Prusa i3 MK3S

      undefined 1 Reply Last reply 17 Jul 2018, 21:50 Reply Quote 0
      • undefined
        Phaedrux Moderator @OBELIKS
        last edited by Phaedrux 17 Jul 2018, 21:50

        @obeliks I'm not so sure about that. I've seen detect thin walls do some crazy things. 😉

        I think the reason that reducing the resolution makes things a bit better is that detect thin walls is basically pulsing the extruder at the start of a segment and then dragging the blob of plastic out to try and get a thinner extrusion width than you've actually specified. By reducing the resolution you now have fewer and longer segments so it has to pulse less.

        On a slightly related note, just the other day I noticed that someone has a pull request outstanding for Prusa Slic3r to completely redo how thin walls are handled. It looks promising.

        Z-Bot CoreXY Build | Thingiverse Profile

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        • undefined
          OBELIKS
          last edited by 17 Jul 2018, 21:53

          Can you check both gcode files, and see how many lines you get for the second ;BEFORE LAYER CHANGE
          Because for me it doubled with thin walls disabled.

          P3Steel Toolson mk2 - Duet 2 WiFi --> RatRig V-Core with Duet WiFi 1.03
          Original Prusa i3 MK3S

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          • undefined
            Phaedrux Moderator
            last edited by 17 Jul 2018, 22:02

            @phaedrux said in Problem printing circles:

            full gcode

            https://www.dropbox.com/s/ormosogim0yaeq2/sliced gcode.7z?dl=1

            They can be found here.

            Z-Bot CoreXY Build | Thingiverse Profile

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            • undefined
              OBELIKS
              last edited by 17 Jul 2018, 22:09

              Thanks. I'll check tomorrow.

              P3Steel Toolson mk2 - Duet 2 WiFi --> RatRig V-Core with Duet WiFi 1.03
              Original Prusa i3 MK3S

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              • undefined
                OBELIKS
                last edited by 18 Jul 2018, 05:31

                I will also try the solution from this thread: https://forum.duet3d.com/topic/6078/core-xy-movement-issues/57

                P3Steel Toolson mk2 - Duet 2 WiFi --> RatRig V-Core with Duet WiFi 1.03
                Original Prusa i3 MK3S

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                • undefined
                  OBELIKS
                  last edited by 18 Jul 2018, 16:12

                  So in additon to the fix above I also erased firmware and uploaded 1.21 Nothing changed.
                  Turning off thin wall detection in Slic3r did help with the juddering, but not completely.
                  Cricles still have flatspots on top and bottom, and printer still sounds rough.

                  So I need to find some time to wire the old board back in and test the steppers.

                  P3Steel Toolson mk2 - Duet 2 WiFi --> RatRig V-Core with Duet WiFi 1.03
                  Original Prusa i3 MK3S

                  undefined 1 Reply Last reply 18 Jul 2018, 16:14 Reply Quote 0
                  • undefined
                    Phaedrux Moderator @OBELIKS
                    last edited by 18 Jul 2018, 16:14

                    @obeliks In addition to turning off thin wall detection did you also change your extrusion width to 0.4?

                    Z-Bot CoreXY Build | Thingiverse Profile

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                    • undefined
                      OBELIKS
                      last edited by 18 Jul 2018, 17:09

                      Yes, and it is a different model anyway. So that is not really needed.

                      P3Steel Toolson mk2 - Duet 2 WiFi --> RatRig V-Core with Duet WiFi 1.03
                      Original Prusa i3 MK3S

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                      • undefined
                        OBELIKS
                        last edited by 18 Jul 2018, 18:47

                        OK, we can stop blaming DuetWifi. I took the time (and anger at some relatives) and I switched to the old board. The uneven circles are almost the same.
                        Left is DuetWifi and right is Anet board, same gcode
                        alt text

                        Now that I have the old board on, I will do another test with Cura and S3D. But that will wait for tomorrow.

                        P3Steel Toolson mk2 - Duet 2 WiFi --> RatRig V-Core with Duet WiFi 1.03
                        Original Prusa i3 MK3S

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                        • undefined
                          sigxcpu
                          last edited by sigxcpu 19 Jul 2018, 10:32

                          That is backlash in Y axis (if this is the printing position). There is also a smaller backlash in X axis, too.

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                            OBELIKS
                            last edited by 19 Jul 2018, 10:36

                            I hope this is true.
                            I really need to reduce weight of the bed assembly. I ordered PCB bed without ALU and thinner glass. That should save me around 500g, and if this goes well I will replace the bed frame for ALU also, at the moment I have inox. That would mean at least 200g.

                            P3Steel Toolson mk2 - Duet 2 WiFi --> RatRig V-Core with Duet WiFi 1.03
                            Original Prusa i3 MK3S

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                            • undefined
                              sigxcpu
                              last edited by 19 Jul 2018, 11:24

                              Unless you have very shitty belts that strech like crazy, there is no reason for the weight of the moving things to generate backlash. I have it too in Y on my CoreXY, but I am sure it is not the axis weight which is pretty thin.
                              If you suspect the weight is an issue then you can play with motors currents and/or acceleration and see if there are any changes.

                              undefined 1 Reply Last reply 19 Jul 2018, 11:43 Reply Quote 0
                              • undefined
                                timcurtis67 @sigxcpu
                                last edited by 19 Jul 2018, 11:43

                                @sigxcpu said in Problem printing circles:

                                Unless you have very shitty belts that strech like crazy, there is no reason for the weight of the moving things to generate backlash. I have it too in Y on my CoreXY, but I am sure it is not the axis weight which is pretty thin.
                                If you suspect the weight is an issue then you can play with motors currents and/or acceleration and see if there are any changes.

                                I agree with this. @deckingman probably has the heaviest print head axis combo of everyone on this forum and he doesn't complain about backlash.

                                Ian, do you want to comment about this?

                                undefined 1 Reply Last reply 19 Jul 2018, 11:58 Reply Quote 0
                                • undefined
                                  OBELIKS
                                  last edited by 19 Jul 2018, 11:57

                                  My bed assembly is in the region of 1,5kg

                                  P3Steel Toolson mk2 - Duet 2 WiFi --> RatRig V-Core with Duet WiFi 1.03
                                  Original Prusa i3 MK3S

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                                    deckingman @timcurtis67
                                    last edited by 19 Jul 2018, 11:58

                                    @timcurtis67 said in Problem printing circles:

                                    Ian, do you want to comment about this?

                                    Not really 😉 ............................

                                    But since you asked...... I have 4kg split between two gantries so roughly 2 kg per XY mechanism. "No name" 6mm GT2 belts. Max X axis speed 50,000, max Y axis speed 35,000, accel 1,000 for both, jerk 600 for both. I have experimented with high print speeds up to 300mm/sec and my default non-print move speed is 350mm/sec. No sign of backlash but everything is pretty rigid. It'll print OK at higher accelerations but with the mass being over a metre above the floor, the printer tends to start to rock about a bit at high speeds.

                                    As an aside, I don't get ringing either - one advantage of high mass 😈

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

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                                    • undefined
                                      OBELIKS
                                      last edited by OBELIKS 19 Jul 2018, 12:06

                                      Hah, I have a i3 style printer. So it is moving a lot. 😁
                                      I will investigate the whole mechanics of X and Y, something is wrong there, that I am certain.

                                      Aaaand, he deleted the post 🙂

                                      P3Steel Toolson mk2 - Duet 2 WiFi --> RatRig V-Core with Duet WiFi 1.03
                                      Original Prusa i3 MK3S

                                      undefined 1 Reply Last reply 19 Jul 2018, 12:08 Reply Quote 0
                                      • undefined
                                        deckingman @OBELIKS
                                        last edited by deckingman 19 Jul 2018, 12:08

                                        @obeliks said in Problem printing circles:

                                        Hah, I have a i3 style printer. So it is moving a lot. 😁
                                        I will investigate the whole mechanics of X and Y, something is wrong there, that I am certain.

                                        Aaaand, he deleted the post 🙂

                                        Yes, I realised my mistake - hence I deleted the post. For some reason I thought yours was a CoreXY the same as mine.

                                        Edit. So in which case, you could well have backlash or movement issues in Y

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

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                                        • undefined
                                          Phaedrux Moderator
                                          last edited by 19 Jul 2018, 19:48

                                          You could try reducing the accel and jerk for your Y axis. I think in your config you have X and Y the same. It's not uncommon to use different values for i3 style printers because of the bed weight.

                                          Z-Bot CoreXY Build | Thingiverse Profile

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