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    To much filament at line-start

    Scheduled Pinned Locked Moved
    Tuning and tweaking
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    • pro3dundefined
      pro3d
      last edited by

      The new V-King is running good but I have blobs in start of all lines. To much filament is coming out at start it seems

      With Marlin it was the opposite so I am curious if this has to do with relative extrusion?

      I do have coasting enabled. Titan extruder should be calibrated good

      How can I avoid this without linear advance? I am not capable to configure LA I am sorry0_1548786163413_20190129_192113.jpg

      Valkyrie DIY High Temp 3D Printer

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

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      • Phaedruxundefined
        Phaedrux Moderator
        last edited by

        It would help to see your config.g and your slicer settings. Is the print head pausing at these points? Do you have extra prime on unretract enabled?

        Z-Bot CoreXY Build | Thingiverse Profile

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        • pro3dundefined
          pro3d @Phaedrux
          last edited by

          @phaedrux
          No extra prime. I have retraction between the start points as I do combing within infill only

          ; Drives
          M569 P0 S1 ; Drive 0 goes forwards
          M569 P1 S1 ; Drive 1 goes forwards
          M569 P2 S1 ; Drive 2 goes forwards
          M569 P3 S0 ; Drive 3 goes forwards
          M350 Z16 I0 ; Configure microstepping without interpolation
          M350 X16 Y16 E16 I1 ; Configure microstepping with interpolation
          M92 X80.00 Y80.00 Z3200.00 E406.00 ; Set steps per mm
          M566 X900.00 Y900.00 Z12.00 E900.00 ; Set maximum instantaneous speed changes (mm/min)
          M203 X30000.00 Y30000.00 Z300.00 E9000.00 ; Set maximum speeds (mm/min)
          M201 X1500.00 Y1500.00 Z20.00 E250.00 ; Set accelerations (mm/s^2)
          M906 X1500.00 Y1500.00 Z500.00 E1000.00 I30 ; Set motor currents (mA) and motor idle factor in per cent
          M84 S30 ; Set idle timeout

          0_1548788348281_Ultimaker Cura 29.01.2019 19_58_40.png

          Valkyrie DIY High Temp 3D Printer

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

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          • nhofundefined
            nhof
            last edited by

            Assuming you have calibrated your steps/mm already at your desired temperature and feed rate. If not you may want to double check that.

            225 is pretty hot for PLA which could lead to more oozing than normal. You may find that temperature readings might be a little different than from Marlin (every machine and firmware is slightly different). So you may want to lower that a bit.

            Also are you using any M572pressure advance value? This could cause overextrusion at the start of a line.

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            • Phaedruxundefined
              Phaedrux Moderator
              last edited by

              Your acceleration settings M201 Z20 E250 are quite low. Same for jerk M566 Z12. This could explain a long pause at a layer change that could explain some oozing which would look like over extrusion at the layer transition.

              I suggest trying M201 Z120 E3000 and M566 Z60

              Z-Bot CoreXY Build | Thingiverse Profile

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              • dc42undefined
                dc42 administrators
                last edited by

                Are you quite sure the problem is too much filament at line start, not at line end? That's unusual.

                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

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                • pro3dundefined
                  pro3d @dc42
                  last edited by

                  @dc42

                  Yes I examined this and it is at start - after retraction, so it is by pretraction...?? not a word but you get my meaning..

                  Actually I just came to remember i upped the extruder jerk and I read that this might cause this blob. What extruder jerk should I use on Titan extruder and 800mm bowden?

                  Valkyrie DIY High Temp 3D Printer

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

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                  • dc42undefined
                    dc42 administrators @pro3d
                    last edited by

                    @pro3d said in To much filament at line-start:

                    Actually I just came to remember i upped the extruder jerk and I read that this might cause this blob. What extruder jerk should I use on Titan extruder and 800mm bowden?

                    I use a Titan with 600mm Bowden, and I have extruder jerk set to 600. I haven't tried different values.

                    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

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                    • DocTruckerundefined
                      DocTrucker
                      last edited by

                      This could be general over extrusion causing a high back pressure, the retract easing the pressure but then the un-retract causing a dump of excess filament at the next start.

                      Try seeing how far you need to reduce the extrusion multiplier to get gaps between adjacent extrusion lines then increase the factor until the gaps are a little more than just closed up. Try printing at that settong and see if it eases the issue. It's likely that your retraction settings will need reducing after doing that as they may be larger than needed to compensate for excessive back pressure.

                      Running 3 P3Steel with Duet 2. Duet 3 on the shelf looking for a suitable machine. One first generation Duet in a Logo/Turtle style robot!

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                      • pro3dundefined
                        pro3d @dc42
                        last edited by

                        @dc42 can I ask acceleration also? My prints are terrible atm

                        Valkyrie DIY High Temp 3D Printer

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

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                        • dc42undefined
                          dc42 administrators
                          last edited by

                          I have extruder acceleration set to 1000 in M201, and max extruder speed set to 3600 in M203.

                          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

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                          • JamesMundefined
                            JamesM
                            last edited by

                            Is your filament dry? Even PLA can be affected by moisture although it is much less than say petg or nylon. When I have excess oozing i dry out my filament in a dehydrator.

                            Also, what type of hotend are you using? I only have 2.6mm of retraction on my ender 3 which now has a bowden fed E3D V6 hotend and I used a printed version of a titan called a Pitan extruder.. Too much retraction can cause its own problems.

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                            • pro3dundefined
                              pro3d @JamesM
                              last edited by

                              @jamesm

                              I am not sure of the filament but I have printed several types now and they all are terrible even if right out of the box

                              Hotend is e3d v6 brand new 1.75 bowden 800mm and retraction I tested from 4 to 7 mm with 6 as the starting point

                              Here is config as of now
                              M350 Z16 I0 ; Configure microstepping without interpolation
                              M350 X16 Y16 E16 I1 ; Configure microstepping with interpolation
                              M92 X80.00 Y80.00 Z3200.00 E406.00 ; Set steps per mm
                              M566 X900.00 Y900.00 Z60.00 E600.00 ; Set maximum instantaneous speed changes (mm/min)
                              M203 X30000.00 Y30000.00 Z300.00 E30000.00 ; Set maximum speeds (mm/min)
                              M201 X1500.00 Y1500.00 Z120.00 E3000.00 ; Set accelerations (mm/s^2)
                              M906 X1500.00 Y1500.00 Z500.00 E1000.00 I30 ; Set motor currents (mA) and motor idle factor in per cent

                              I then added this without any noticable difference:
                              M572 D0 S0.25 ; Pressure Advance

                              here are some sample prints with PA activated and 5mm retract - PETG 40mms 240/85 add-North

                              1_1549306658765_20190201_214616.jpg 0_1549306658765_20190203_134817.jpg

                              Here some before PA with 6,5mm with 6.5mm retract - Older PETG - 240/85 50mms
                              1_1549306937841_20190204_200051_HDR.jpg 0_1549306937840_20190204_200110_HDR.jpg

                              Valkyrie DIY High Temp 3D Printer

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

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                              • dc42undefined
                                dc42 administrators
                                last edited by

                                It's hard to compare them because the photos with/without PA are of different parts (i think) taken at different magnification/zoom. The two photos of the red object look as though they would definitely benefit from pressure advance.

                                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

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                                • Maboverundefined
                                  Mabover
                                  last edited by

                                  Have you tried turning off microstepping interpolation on the extruder axis?
                                  I have had similar issues with to much filament at the start of line, I used negative unretact and PA to compensate for it in the past. Recently I saw some talk in another thread that lead me to try disabling interpolation as a possible solution.
                                  I have only performed a quick test print last weekend but the results looked very promising, I need to perform followup testing to confirm the results.
                                  I also changed microstepping on the extruder axis to 32 to help keep the noise from the extruder limited.

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                                  • pro3dundefined
                                    pro3d @Mabover
                                    last edited by

                                    @mabover oh.. Thanks a lot for this tip. I still fight retraction issues and have almost given up on tuning it... I will try this for sure

                                    Valkyrie DIY High Temp 3D Printer

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

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                                    • pro3dundefined
                                      pro3d @Mabover
                                      last edited by

                                      @mabover
                                      Do you use coasting in addition to PA?

                                      Valkyrie DIY High Temp 3D Printer

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

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