3DPrinting@lemmy.worldbyNatanox@discuss.tchncs.de
1 day

How to properly get rid of holes between perimeters?

English
Close-up of a 3D printed part on the build plate currently in progress of being printed. Two arrows point at locations where the perimeter lines aren't attached to each other.

I’m somewhat puzzled which settings I need to look at in PrusaSlicer to solve those thin slits between perimeters. I’ve dialed in the flowrate optimally for dimensional correctness and 245°C (PETG) works really well for both flow and overhangs.

At first I thought of extrusion width, but that also increases the distance between each line. Raising the flowrate closes them, but also makes the printed parts grow in each dimension outside if the intended size.

Where am I missing something? Which settings do I need to adjust to not screw up everything else?

EDIT: It’s not just corners!

10
    • Bluewing@lemmy.worldEnglish
      9 hours

      I know it’s not as popular anymore, but this is why we calibrate our printers. [(https://ellis3dp.com/Print-Tuning-Guide/articles/index_tuning.html)] This is an excellent guide to getting your printer to work to near perfection if you do all the tests. But it does take time and effort to learn and do.

      If you switch to Orca, they have a pretty decent calibration suite built in. It’s not as rigorous as Ellis, but good enough for most things.

    • iceberg314@midwest.socialEnglish
      9 hours

      Might not be your issue, butI had issues like this on my ender 3 and I eventually replaced the hotend and they went away. It was like the old hotend just didn’t have a consistent flow and there was some sort of clog or heating issue

    • faebudo@infosec.pubEnglish
      1 day

      If it’s in corners only tune Pressure Advance, but as this is on the first layer it’s probably only the first layer, which is generally different from subsequent layers. Check the same thing on a higher layer to make sure that there really is a problem.

      • Natanox@discuss.tchncs.deEnglish
        1 day

        It’s not only on the first layer and also not only around corners (indeed the first layer is perfectly fine). The perspective is a little bit misleading, this is the third or fourth layer. Happens on all layers, it’s just a little bit more common around corners and bends.

        • nomad@infosec.pubEnglish
          1 day

          Try decreasing the speed in corners and increase pressure advance a bit. There is a tuning print you can use.

            • MrTolkinghoen@lemmy.zipEnglish
              18 hours

              PA can impact more than just corners. It’s when the print head is changing speed/direction

                • MrTolkinghoen@lemmy.zipEnglish
                  4 hours

                  Calibration of a printer is very much a cumulitive thing. Looking at your print I think your PA is off, but I would guess that it’s a combination of multiple settings. When calibrating a filament, I usually do a sweep of calibrations, and then sometimes even come back to past steps to rerun since the values can impact eachother.

                  I.e. I typically do in this order per brand of filament type. Always starting with the closest preset I can find. Usually the generic version if there isn’t the brands of exact filament as a preset in orca.

                  Temperatue

                  Max volumetric speed

                  Pressure advance

                  Flow

                  Retraction

                  Sometimes back to PA because flow can impact PA

                  VFA/input shaping (optional)

                  And then toss a tolerance calibration at it at the end, but I don’t typically do this per filament, just do it per printer unless you’re about to print some super tolerance intolerant parts

                  IMO your flow / pa are off and combined are causing this. But idk, if you’ve already done both those calibrations then I’m not experienced enough to be able to definitively say what the issue is.