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    Strange Blobbing on Layer Change

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    • giostarkundefined
      giostark @davidewen
      last edited by

      @davidewen
      Yep the Z in M566 could be higher. Right now I have just a delta printer and settled 800 on all 3 axis.
      You have 900 on x and y. Why so slow on z with just 60?
      David suggest the default as 600 in this post:
      https://forum.duet3d.com/topic/310/m566-what-s-a-good-number
      But someone use even 1200.

      Please if you found the solution replay here so that will be useful to us all 😀

      ps:
      I have to learn to check before the config.g and then the slicer , damn. Here the phaedrux's skill was evident!
      My advice still remain good for refinement 😉

      davidewenundefined 1 Reply Last reply Reply Quote 0
      • davidewenundefined
        davidewen @giostark
        last edited by

        @giostark @Phaedrux ,

        Thanks for your help.
        Changing the Z Axis speed has definitely helped.

        I'm still getting a dimple at the Z-Seam, but not blobs as before.

        new numbers.
        M566 X1500.00 Y1500.00 Z600.00 E120.00 ; set maximum instantaneous speed changes (mm/min)

        6597B7F5-C67E-4A35-846F-E04FCB0749E1.jpeg CFF5A990-9E8D-45AF-897E-8A8CC5D36703.jpeg AC7BDEB0-77DF-44CC-940A-A39AF0275FD1.jpeg

        test cone (N)0.6 (L)0.36 (IF)15% (S)80 (T)250°C (F)ASA (T)9m .gcode

        giostarkundefined Norderundefined 2 Replies Last reply Reply Quote 0
        • Phaedruxundefined
          Phaedrux Moderator
          last edited by

          Increase your extruder jerk.

          Z-Bot CoreXY Build | Thingiverse Profile

          davidewenundefined 1 Reply Last reply Reply Quote 0
          • giostarkundefined
            giostark @davidewen
            last edited by

            @davidewen
            On the Bondtech BMG I have settled E1200. Tie well the screw otherwise the gears will dent the wire.

            1 Reply Last reply Reply Quote 0
            • Norderundefined
              Norder @davidewen
              last edited by Norder

              @davidewen
              How many mm is your retract in the slicer and at what speed does it run ?

              DDA5X... 0.9° Stepper... Linearrails... Duet 2 Wifi... PT100 Board... Duet IR-Probe... Dyze Pro Kit up to 500°C.. etc
              Thingiverse

              davidewenundefined 1 Reply Last reply Reply Quote 0
              • davidewenundefined
                davidewen @Phaedrux
                last edited by

                @Phaedrux
                Sorry for the slow response. We're trying to get a big project out the door and that has been consuming time.

                I've increased jerk in PrusaSlicer to the following;
                X: 32
                Y: 32
                Z: 32
                E: 20

                And here are my config.g settings

                M566 X1500.00 Y1500.00 Z600.00 E120.00			; set maximum instantaneous speed changes (mm/min)
                
                M203 X12000.00 Y12000.00 Z600.00 E2100.00		; set maximum speeds (mm/min)
                M201 X1500.00 Y1500.00 Z500.00 E250.00			; set accelerations (mm/s^2)
                
                

                Still getting the same results.

                Phaedruxundefined 1 Reply Last reply Reply Quote 0
                • davidewenundefined
                  davidewen @Norder
                  last edited by

                  @Norder
                  PrusaSlicer Retraction settings;
                  Length: 0.8
                  Z lift: 0.4
                  Speed: 40
                  Min Travel: 2
                  Retract on layer: off
                  Min travel after retract: 2
                  Wipe while retracting; on
                  retract amount before wipe: 80%

                  weed2allundefined Norderundefined 2 Replies Last reply Reply Quote 0
                  • weed2allundefined
                    weed2all @davidewen
                    last edited by weed2all

                    @davidewen try retracting a little bit more...like 0.85 or 0.90! Also reduce the retraction speed to something like 25 to 30
                    Jerk values are to high!

                    https://www.thingiverse.com/weed2all/designs

                    1 Reply Last reply Reply Quote 0
                    • Norderundefined
                      Norder @davidewen
                      last edited by

                      @davidewen
                      So far the settings look good.
                      If you don't have stringing or other problems with blobs or similar, then the 0.8mm retraction path is probably OK. But it can change depending on the temperature and filament and then higher values would be more suitable, which could then go up to 1.5mm.

                      That with the speed could reduce this gap at the Z-seam, as weed2all already wrote, 25-30 mm/s may be better values for you.

                      If these changes don't bring any improvements, you could enter something under "Extra length on restart". Step up there by 0.1mm.
                      This option of "Extra length on restart" is rarely used.

                      Google Translate
                      -- Original Text --

                      Soweit sehen die Einstellungen gut aus.
                      Wenn Du kein Stringing hast oder sonstige Probleme mit Kleckse o.ä., dann sind die 0.8mm Rückzugsweg wohl OK. Es kann sich aber je nach Temperatur und Filament ändern und dann wären höhere Werte besser geeignet die dann gerne mal bis 1.5mm gehen könnten.

                      Das mit der Geschwindigkeit könnte diesen Spalt an der Z-Naht verringern, wie weed2all bereits schrieb sind 25-30 mm/s gegebenenfalls bessere Werte für Dich.

                      Sollten diese Änderungen keine Verbesserungen bringen, dann könntest Du bei "Extralänge bei Neustart" etwas eintragen. Dort Schrittweise mit 0.1mm herangehen.
                      Diese Option der "Extralänge bei Neustart" wird eher selten genutzt.

                      DDA5X... 0.9° Stepper... Linearrails... Duet 2 Wifi... PT100 Board... Duet IR-Probe... Dyze Pro Kit up to 500°C.. etc
                      Thingiverse

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

                        @davidewen said in Strange Blobbing on Layer Change:

                        I've increased jerk in PrusaSlicer to the following;
                        X: 32
                        Y: 32
                        Z: 32
                        E: 20

                        Where did you change that?

                        I assume that's in mm/s?

                        Does prusa slicer now allow per move jerk settings as well as acceleration? I didn't think so.

                        Is your prusa slicer set to RepRap gcode flavour?

                        Can you share a sliced gcode file?

                        Your config file still has the limits set very low, so unless your slicer is actually sending M566/M203/M201 commands to change the limits during a print you are being limited by the config.g

                        Z-Bot CoreXY Build | Thingiverse Profile

                        Norderundefined davidewenundefined 2 Replies Last reply Reply Quote 0
                        • Norderundefined
                          Norder @Phaedrux
                          last edited by Norder

                          @Phaedrux

                          Does prusa slicer now allow per move jerk settings as well as acceleration? I didn't think so.

                          The PrusaSlicer has its own jerk setting (mm/s), maximum acceleration (mm/s²) and maximum feed (mm/s)
                          for each axis.

                          DDA5X... 0.9° Stepper... Linearrails... Duet 2 Wifi... PT100 Board... Duet IR-Probe... Dyze Pro Kit up to 500°C.. etc
                          Thingiverse

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

                            @Norder said in Strange Blobbing on Layer Change:

                            The PrusaSlicer has its own jerk setting

                            Where? You mean in the machine limits?

                            Z-Bot CoreXY Build | Thingiverse Profile

                            Norderundefined 1 Reply Last reply Reply Quote 0
                            • Norderundefined
                              Norder @Phaedrux
                              last edited by

                              @Phaedrux
                              Yes, exactly.
                              But it is clear that the upper limit is determined by the config.g.

                              DDA5X... 0.9° Stepper... Linearrails... Duet 2 Wifi... PT100 Board... Duet IR-Probe... Dyze Pro Kit up to 500°C.. etc
                              Thingiverse

                              davidewenundefined 1 Reply Last reply Reply Quote 0
                              • davidewenundefined
                                davidewen @Norder
                                last edited by

                                @Norder @Phaedrux @weed2all

                                Thank you all for responding.
                                I will not be able to check settings or respond back with said settings until late next week.

                                Cheers

                                1 Reply Last reply Reply Quote 0
                                • davidewenundefined
                                  davidewen @Phaedrux
                                  last edited by

                                  @Phaedrux

                                  Yes, I made those changes in PrusaSlicer.
                                  Are you suggesting that I make the changes in config.g?
                                  And if so, is that command M566?

                                  My current M566 is not labeled "jerk" so I just want to confirm.

                                  M566 X1500.00 Y1500.00 Z600.00 E120.00			; set maximum instantaneous speed changes (mm/min)
                                  
                                  M203 X12000.00 Y12000.00 Z600.00 E2100.00		; set maximum speeds (mm/min)
                                  
                                  M201 X1500.00 Y1500.00 Z500.00 E250.00			; set accelerations (mm/s^2)
                                  
                                  1 Reply Last reply Reply Quote 0
                                  • Phaedruxundefined
                                    Phaedrux Moderator
                                    last edited by

                                    Yes, maximum instantaneous speed changes is often called jerk.

                                    Z-Bot CoreXY Build | Thingiverse Profile

                                    davidewenundefined 1 Reply Last reply Reply Quote 0
                                    • davidewenundefined
                                      davidewen @Phaedrux
                                      last edited by

                                      @Phaedrux

                                      Got it. Do you have some recommendations from my current settings?

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

                                        @davidewen Try these

                                        M566 X1500.00 Y1500.00 Z600.00 E3000			; set maximum instantaneous speed changes (mm/min)
                                         
                                        M203 X12000.00 Y12000.00 Z600.00 E6000		; set maximum speeds (mm/min)
                                         
                                        M201 X1500.00 Y1500.00 Z500.00 E3000			; set accelerations (mm/s^2)
                                        

                                        Z-Bot CoreXY Build | Thingiverse Profile

                                        davidewenundefined 1 Reply Last reply Reply Quote 0
                                        • davidewenundefined
                                          davidewen @Phaedrux
                                          last edited by

                                          @Phaedrux
                                          Thanks for the info. This has helped a lot. Seam is still there, but greatly improved.
                                          I will play around with these settings to see if I can get it to almost perfect.

                                          Cheers!

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

                                            @davidewen said in Strange Blobbing on Layer Change:

                                            Seam is still there, but greatly improved.

                                            Have you tune pressure advance yet? That's the remaining piece of the puzzle.

                                            https://docs.duet3d.com/en/User_manual/Tuning/Pressure_advance

                                            Z-Bot CoreXY Build | Thingiverse Profile

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