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    Steppers Grinding/Jerking On Arcs

    Tuning and tweaking
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    • dzg7pl
      dzg7pl last edited by

      Hi there,

      I've been trying to solve this for a while now, but I have now idea why it is happening. I have a Duet 2 WiFi from around 2019 (latest firmware) and for a while now I've had issues with printing arcs/circles/anything curved in that the steppers jerk/grind/resonate the whole printer. It has no issues printing straight sections, so pretty sure it's not a mechanical issue (e.g. loose belts or crap rails). I've also tried different steppers, but no joy.

      Printing a test file highlights results of the jerky motion. It's a bit out of focus, but I think it shows the issue well enough.

      I've also taken a video of the print to demonstrate the effect of the jerky motion/resonance.

      The issue also does not present itself when printing at (significantly) lower speeds.

      Any help would be very much appreciated!

      Cheers 🙂

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

        Post your config.g and perhaps a sliced gcode file so we can see the settings.

        Z-Bot CoreXY Build | Thingiverse Profile

        dzg7pl 1 Reply Last reply Reply Quote 1
        • dzg7pl
          dzg7pl @Phaedrux last edited by

          @phaedrux thank you for the reply 🙂

          Here is the gcode

          Here is my config.g

          dc42 1 Reply Last reply Reply Quote 0
          • dc42
            dc42 administrators @dzg7pl last edited by dc42

            @dzg7pl from your config.g:

            M566 X150 Y150 Z12 E9000 P1 ; Set maximum instantaneous speed changes (mm/min)

            That's a very low setting, which will likely cause printing to slow down and print at an uneven speed when printing curves. Try increasing the X and Y values to 600.

            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

            dzg7pl 1 Reply Last reply Reply Quote 0
            • dzg7pl
              dzg7pl @dc42 last edited by dzg7pl

              @dc42 That was it! 🤦 I had to up it to 2000 to completely remove the issue.

              Thank you so much 🙂

              bberger 1 Reply Last reply Reply Quote 0
              • bberger
                bberger @dzg7pl last edited by

                @dzg7pl this seems a bit excessive in the other direction imho. Curious what your acceleration and speed settings are.

                dzg7pl 1 Reply Last reply Reply Quote 0
                • dzg7pl
                  dzg7pl @bberger last edited by

                  @bberger 117a4880-deeb-4957-86de-2deef2c3a6f0-image.png

                  Bit embarrassed to post that TBH 🤦

                  bberger 1 Reply Last reply Reply Quote 0
                  • bberger
                    bberger @dzg7pl last edited by bberger

                    @dzg7pl no need to be embarrassed, but thay 10k acceleration on perimeters vs 6k on infill does look a bit weird. If you can do 10k perimeters without ringing then you can go full blast on infill.

                    What's your printer? 150 travel also seems a bit low of it actually can handle 1G acceleration. Also you're limiting your max speed at 120 (last 2 boxes), so your printer won't do that 150 from infill. You could just set everything to 0 where you have 120+mm/s or 100% and do 120mm/s everywhere by just using autospeed.

                    dzg7pl 1 Reply Last reply Reply Quote 0
                    • dzg7pl
                      dzg7pl @bberger last edited by

                      @bberger

                      Hey, thanks for the reply 🙂 My printer is a heavily modified Tronxy X5S - very few original bits remain on it... Even after the 3-4 years of owning it, I've never got it to a point where I'm happy with the results. I'm slowly getting there, but I struggle with ringing/ghosting, which is probably the cause of the low values for the M566 command. Currently rebuilding the bed support as I think there's some flex in there. 🤞

                      bberger 1 Reply Last reply Reply Quote 0
                      • bberger
                        bberger @dzg7pl last edited by

                        @dzg7pl have a look at the VzBot. It too started out as a heavily modified tronxy S5ZYX123. Maybe you can get some inspiration there.

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