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    Bowden - PETG How to reduce stringing?

    Tuning and tweaking
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    • pro3d
      pro3d last edited by pro3d

      Do I increase retract or PA parameter? or both to reduce stringing

      This is a long bowden 750mm with e3d Titan extruder printing PLA great at R 3,5mm / PA S0,15

      This is what I tried so far
      Retraction 4 - 4,5 mm
      PA S0,15
      Retract Speed 60
      Prime Speed 30
      Travel Speed 150
      Accel 1500
      jerk 900mm/min
      Printspeed 60-75

      Tips to reduce stringing please 🙂

      Valkyrie DIY High Temp 3D Printer

      R&D - Engineering Designer - Viking 3D Printers
      https://vkingprinter.com/

      Scachi deckingman 2 Replies Last reply Reply Quote 0
      • Scachi
        Scachi @pro3d last edited by Scachi

        @pro3d Same length of bowden here. e3d hotend with https://www.thingiverse.com/thing:1318849
        I use
        Retraction 6mm ,
        Retract Speed 90
        PA S0,4
        Not sure about my other values.. modifying the printer hardware at the moment.

        pro3d 1 Reply Last reply Reply Quote 0
        • pro3d
          pro3d @Scachi last edited by pro3d

          @scachi

          Wow those values are high. What do you use for PLA? What extruder? - edit got the extruder thanks

          Valkyrie DIY High Temp 3D Printer

          R&D - Engineering Designer - Viking 3D Printers
          https://vkingprinter.com/

          Scachi 1 Reply Last reply Reply Quote 0
          • Scachi
            Scachi @pro3d last edited by

            @pro3d
            Forgot to mention that my print speed is lower: 30 - 50.
            For some petg brands I need to use a speed of 30 , for other ones I can go to 60 and lower PA to 0.3

            For PLA is can use a bit higher printing speed 50-70 and reduce PA to 0.2 and retraction to 4.5 - 5mm

            1 Reply Last reply Reply Quote 0
            • deckingman
              deckingman @pro3d last edited by deckingman

              @pro3d said in Bowden - PETG How to reduce stringing?:

              Do I increase retract or PA parameter? or both to reduce stringing

              This is a long bowden 750mm with e3d Titan extruder printing PLA great at R 3,5mm / PA S0,15

              This is what I tried so far
              Retraction 4 - 4,5 mm
              PA S0,15
              Retract Speed 60
              Prime Speed 30
              Travel Speed 150
              Accel 1500
              jerk 15
              Printspeed 60-75

              Tips to reduce stringing please 🙂

              Jerk of 15? Is that extruder or carriage? That's really low. Does pressure advance work for you? Do arcs print really slowly? That aside, extruder jerk won't be applied to retract moves (according to DC in another thread) but it will have an impact on pressure advance which in turn might have an impact on blobs and stringing.

              I've also found that running high travel speed helps, if your printer is capable of it. The less time the print head takes to do travel moves, the less time there is for the filament to ooze. I run 350mm/sec but of course, the actual speed depends on if the non-print move is long enough for the head to accelerate up to that speed.

              Having said all that, I've never been able to completely eliminate fine "hairs" when printing PETG - but a hair dryer or careful use of a hot air gun sorts them out ☺

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

              pro3d 1 Reply Last reply Reply Quote 0
              • pro3d
                pro3d @deckingman last edited by

                @deckingman

                15 jerk on all axis except Z so E as well yes - What is recommended?

                PA works after long painful tuning on PLA. I dont know if it works on PETG (Actually CPE) and wonder if it need retuned and what to tune

                I dont know how quick I can travel. Have run 300 in dry runs, I thought 150 was good travel but anyway when distance is so short it never will reach anything close to it if accel is 1500 so makes little sense going to 300?

                I can manage the hairs but would like to decrease them to what I used to have which was close to nothing so wonder about tuning in general for different materials

                Valkyrie DIY High Temp 3D Printer

                R&D - Engineering Designer - Viking 3D Printers
                https://vkingprinter.com/

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                • pro3d
                  pro3d last edited by

                  You can see it printing here
                  https://www.facebook.com/vking3d/videos/448935422531033/

                  Valkyrie DIY High Temp 3D Printer

                  R&D - Engineering Designer - Viking 3D Printers
                  https://vkingprinter.com/

                  1 Reply Last reply Reply Quote 0
                  • JamesM
                    JamesM last edited by JamesM

                    I hope you realize that on the Duet, both the accel and jerk values are mm/min not mm/sec so if you have your jerk set at 15 it is way too low.

                    pro3d 1 Reply Last reply Reply Quote 0
                    • pro3d
                      pro3d @JamesM last edited by

                      @jamesm
                      OH sorry yes I mean 900 in jerk... 15 mms

                      Valkyrie DIY High Temp 3D Printer

                      R&D - Engineering Designer - Viking 3D Printers
                      https://vkingprinter.com/

                      deckingman 1 Reply Last reply Reply Quote 0
                      • deckingman
                        deckingman @pro3d last edited by

                        @pro3d 900 for extruder jerk makes a bit more sense that 15 but you might find PA is easier to get right if you use something like 3600. Also try 1200 to 1800 for your X and Y. Then the carriages won't slow down quite so much which can help.

                        Have you tried different temperatures? This can make a great deal of difference to blobs and stringing. Also, for sure anything that affects the viscosity of the filament will have an effect on the pressure advance you need. So you'll likely need a different setting for PET-G but establish the best (lowest) temperature first, before attempting the tune PA.

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

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

                          You could use M204 Pn Tn to separately tune your print acceleration and your travel acceleration. That could help speed up your travel moves quite a bit which could help with the stringing.

                          Also, I find that with PETG temperature has a large impact on stringing. A few degrees lower is usually enough to eliminate the majority of it.

                          Z-Bot CoreXY Build | Thingiverse Profile

                          1 Reply Last reply Reply Quote 1
                          • DocTrucker
                            DocTrucker last edited by

                            PETG is intollerant to over extrusion too. Slightest overbuild and you're likely to pick up strings as the nozzle drags and periodically dump lumps of oxidisted plastic onto your print.

                            Alive: 1 Ormerodish machines. 1 Custom Cantilever. 3 P3Steel. 1 Ciclopish scanner. In build: 1 P3Steel. Controllers: 2 Duet 2 , 2 D0.6, 1 D0.8.5, 1 D3 v0.5, 1 RAMPS/DRV8825, 1 Uno/Scan Card.

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