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    Circles coming out jagged

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    • Festivejellyundefined
      Festivejelly
      last edited by

      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

      jay_s_ukundefined 1 Reply Last reply Reply Quote 0
      • jay_s_ukundefined
        jay_s_uk @Festivejelly
        last edited by

        @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

        Festivejellyundefined 2 Replies Last reply Reply Quote 0
        • Festivejellyundefined
          Festivejelly @jay_s_uk
          last edited by

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

          Phaedruxundefined 1 Reply Last reply Reply Quote 0
          • Festivejellyundefined
            Festivejelly @jay_s_uk
            last edited by

            @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.

            gloomyandyundefined 1 Reply Last reply Reply Quote 0
            • gloomyandyundefined
              gloomyandy @Festivejelly
              last edited by

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

              Festivejellyundefined 1 Reply Last reply Reply Quote 0
              • Festivejellyundefined
                Festivejelly @gloomyandy
                last edited by

                @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,

                1 Reply Last reply Reply Quote 0
                • Phaedruxundefined
                  Phaedrux Moderator @Festivejelly
                  last edited by

                  @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

                  Festivejellyundefined 1 Reply Last reply Reply Quote 0
                  • Festivejellyundefined
                    Festivejelly @Phaedrux
                    last edited by

                    @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

                    1 Reply Last reply Reply Quote 0
                    • Phaedruxundefined
                      Phaedrux Moderator
                      last edited by

                      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

                      Festivejellyundefined 1 Reply Last reply Reply Quote 0
                      • Festivejellyundefined
                        Festivejelly @Phaedrux
                        last edited by

                        @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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