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Circles coming out jagged

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  • undefined
    Festivejelly
    last edited by 25 Mar 2024, 22:32

    Ive updated my firmware on my duet 2 wifi so that I could use an accelerometer.

    All seems to be going okay except circles are being printed all jagged, like it cannot handle doing curves. I thought RRF had arc support?

    Its very odd because essentially on any curves it prints them all jagged.

    In the slicer it looks absolutely fine, no weird segmentation. Any ideas? Could it be the duet cant handle the speeds/accel? im going around 150mm/s

    1 Reply Last reply Reply Quote 0
    • undefined
      Festivejelly
      last edited by 25 Mar 2024, 22:58

      Jerk and acceleration settings

      M350 X16 Y16 Z16 I1 ; Configure microstepping with interpolation
      M566 X300 Y300 Z8 C2 E200:200:200:200 ; Set maximum instantaneous speed changes (mm/min)
      M203 X35000 Y35000 Z600 C5000 E5000:5000:5000:5000 ; Set maximum speeds (mm/min)
      M201 X4000 Y4000 Z100 C500 E4000:4000:4000:4000 ; Set accelerations (mm/s^2)

      Version 3.5.0 RC2

      undefined 1 Reply Last reply 26 Mar 2024, 05:46 Reply Quote 0
      • undefined
        jay_s_uk @Festivejelly
        last edited by 26 Mar 2024, 05:46

        @Festivejelly your z jerk is stupidly low. Don't forget it's in mm/min so 8 would be 0.13mm/s

        Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

        undefined 2 Replies Last reply 26 Mar 2024, 20:57 Reply Quote 0
        • undefined
          Festivejelly @jay_s_uk
          last edited by 26 Mar 2024, 20:57

          @jay_s_uk Im not seeing a problem on the Z but thats an interesting observation.

          undefined 1 Reply Last reply 26 Mar 2024, 21:29 Reply Quote 0
          • undefined
            Festivejelly @jay_s_uk
            last edited by 26 Mar 2024, 21:00

            @jay_s_uk Its based on part on this: https://github.com/Duet3D/RRF-machine-config-files/blob/master/E3D_Tool_Changer/dc42-duet3-centreZero-2Titan-2Hemera/sys/config.g

            Always worked fine for me in the past.

            undefined 1 Reply Last reply 26 Mar 2024, 21:05 Reply Quote 0
            • undefined
              gloomyandy @Festivejelly
              last edited by 26 Mar 2024, 21:05

              @Festivejelly Can you post an example of a circle and perhaps the gcode used to produce it.

              undefined 1 Reply Last reply 26 Mar 2024, 21:08 Reply Quote 0
              • undefined
                Festivejelly @gloomyandy
                last edited by 26 Mar 2024, 21:08

                @gloomyandy Ill try and create generic one as I cant share the Gcode for the actual objects. But I do wonder if its a quirk of Bambu Slicer as ive been using that as it allows to print walls inner out inner.

                Im going to slice the file in Prusa Slicer and see if it has the same issues,

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                • undefined
                  Phaedrux Moderator @Festivejelly
                  last edited by 26 Mar 2024, 21:29

                  @Festivejelly said in Circles coming out jagged:

                  @jay_s_uk Im not seeing a problem on the Z but thats an interesting observation.

                  If you have mesh compensation active, Z would certainly play a part.

                  Your X and Y jerk are also very low. Circles are still made up of segments.

                  I think you should test with X Y and Z jerk set to 600 and see if it improves.

                  Z-Bot CoreXY Build | Thingiverse Profile

                  undefined 1 Reply Last reply 26 Mar 2024, 21:50 Reply Quote 0
                  • undefined
                    Festivejelly @Phaedrux
                    last edited by 26 Mar 2024, 21:50

                    @Phaedrux I'll give that a shot, they were always fine that low in the past but i'll give it a shot if not just to rule it out. Ive also increased the Z jerk

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                    • undefined
                      Phaedrux Moderator
                      last edited by 26 Mar 2024, 21:55

                      You don't mention your firmware version, but recent changes in pressure advance and input shaping may also have an impact on jerk.

                      What firmware were you on before, and what firmware are you on now?

                      Z-Bot CoreXY Build | Thingiverse Profile

                      undefined 1 Reply Last reply 27 Mar 2024, 00:23 Reply Quote 0
                      • undefined
                        Festivejelly @Phaedrux
                        last edited by 27 Mar 2024, 00:23

                        @Phaedrux I think it was 3.4.3 ill need to hunt around in my files but I dont think the binaries are named by the version so might be hard to tell.

                        I upgraded the version to use the duet accelerometer which ended up being a dud anyway, wish id stayed on the version I was on!

                        Ive rolled back to an older firmware version and it seems to be printing better now but the ringing is all over the shop even with input shaping. I wonder if the input shaping is actually causing this.

                        Im not entirely confident in the input shaping values from the sensor tbh.

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