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Large Seam Gap with thick nozzle

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  • undefined
    Adamfilip
    last edited by 20 Feb 2023, 04:44

    Printing petg thick, 0.8mm nozzle and 0.5mm layers, getting a large seam gap. Filament is dry. using prusaslicer need suggestions please

    240 temp, 50mm/s, 500/s accel in slicer, 3k accel in firmware
    1mm retraction, 0.1mm extra restart

    371ef333-1efe-48c7-aaa6-16d811df57b9-image.png

    undefined 1 Reply Last reply 20 Feb 2023, 08:40 Reply Quote 0
    • undefined
      o_lampe @Adamfilip
      last edited by 20 Feb 2023, 08:40

      @Adamfilip To figure out if it's pressure advance- or retraction-related you could tell slicer where to put the seam.
      Don't put it in a corner for testing.

      undefined 1 Reply Last reply 20 Feb 2023, 12:54 Reply Quote 0
      • undefined
        Adamfilip @o_lampe
        last edited by 20 Feb 2023, 12:54

        @o_lampe during tuning. I ended up disabling pressure advance as it didnt seem to be making any improvements with a large nozzle

        was previously at
        ;M572 D0 S0.025

        undefined 1 Reply Last reply 20 Feb 2023, 14:07 Reply Quote 0
        • undefined
          deckingman @Adamfilip
          last edited by deckingman 20 Feb 2023, 14:07

          @Adamfilip The cross sectional area of a 0.4mm nozzle is about 0.125mm^2. The area of a 0.8mm nozzle is about 0.5mm^2. Also, a 0.4mm nozzle would normally have a layer height of about 0.3mm whereas you are using 0.5mm with the 0.8mm nozzle. So the difference in cross sectional area x the extra layer height gives a volumetric flow rate of roughly 6.7 times more than 0.4mm nozzle. Your 50mm /sec print speed would translate to a print speed of about 330mm/sec with the 0.5 mm nozzle for the same volumetric flow rate. Are you able to print at that? If not, then I suggest you slow down the speed somewhat - somewhere about 1/6th or 1/5th of the print speed you use with a 0.4 or 0.5mm nozzle would seem to be appropriate. You are right that PA will probably have little to no effect because any pressure build up will be a lot less with a 0.8mm nozzle. You are likely to need much more retraction though, to help with the inherent "oozing" problems that large nozzles have.

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

          undefined undefined 2 Replies Last reply 20 Feb 2023, 15:23 Reply Quote 0
          • undefined
            patterson6 @deckingman
            last edited by patterson6 20 Feb 2023, 15:23

            I use big nozzles all the time up to 1.2mm. What does the part look like in your slicer? Thats what it looks like if you have thin walls or sharp corners. How thick is your wall? If the part wall is to thin it might not slice all the way to the end of your corner on your part.

            Also use layer height at .4 for better prints. Raise your extruder temp as well because your prob printing faster than you can melt your plastic in the nozzle. I use 250c on a volcano with a 8mm nut extension and a cht nozzle.

            My .8 nozzle settings.
            extrusion width .96
            retract 2mm
            lift .8
            retract speed 36000
            coasting distance .8
            wipe distance 5mm

            1 Reply Last reply Reply Quote 0
            • undefined
              Adamfilip @deckingman
              last edited by 21 Feb 2023, 16:20

              @deckingman im limiting max volumetric flow to 12 mm3/sec which isnt pushing the extruder too hard

              undefined 1 Reply Last reply 21 Feb 2023, 17:14 Reply Quote 0
              • undefined
                deckingman @Adamfilip
                last edited by 21 Feb 2023, 17:14

                @Adamfilip said in Large Seam Gap with thick nozzle:

                @deckingman im limiting max volumetric flow to 12 mm3/sec which isnt pushing the extruder too hard

                You didn't mention that in your OP - only that you were printing at 50mm/sec. So what is the head speed in reality with that volumetric extrusion limit applied?

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

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