It’s not top thickness, that’s only 3 layers and the bulge is on more layers than that.

Printed with PLA, 4 perimeters, 15% gyroid, but no infill makes difference, i don’t think this is about shell thickness.

Retraction is good, there is no oozing on retract moves and no stringing on the printed parts.

Otherwise the prints come out okay so i’m a bit stuck with this one!

You can see the bulging in all three edges on the picture, about 3-4mm from top to bottom, then a few ok layers, then again a few layers with bulges on corners.

Slicer is Prusa if that’s relevant.

Any ideas are welcome!

    • spckls@lemmy.worldOPEnglish
      7·
      1 year ago

      Damn, i would’ve never thought about that. Went to check the speed in prusa, would you look at that…

      Perfectly corresponds to the bulges.

      Thank you, Detective Carighan!

      • Carighan Maconar@lemmy.worldEnglish
        3·
        1 year ago

        That’s interesting tbh, especially given the one line in the middle. I usually use Cura, so I’m unfamiliar with the Prusa Slicer, what setting causes that variable speed?

        But it’s fascinating, I can even see the bulge in the layer of the single line in your photo, now that I know what to look for. That’d also tell me that maybe you’re running it a bit hotter than it needs for this specific filament, maybe go down 5°C or 10°C. It seems when it slows down, more can ooze than it intends to.

        • spckls@lemmy.worldOPEnglish
          3·
          1 year ago

          It took some time to find the culprit.

          It’s under:

          Filament settings -> Cooling -> Cooling thresholds -> Slow down if layer print time is below: # - and - Min print speed: #

          I am running a bit hot, yes, 215, and the extruder is bowden feed. It does tend to ooze a bit like all bowdens do, that’s why i have to get my speeds and accelerations on point, because the “dynamic” speed/extrusion settings never provide good results for this printer and i don’t know how to account for the oozing on speed changes.

          I’d love to upgrade to a direct extruder, i’m currently using e3d v6 hot end. Do you have any suggestions?

          • Carighan Maconar@lemmy.worldEnglish
            1·
            1 year ago

            Eh, sadly can’t help too much with that. Used to have an Ender 5, but got an Artillery X2 gifted (aye…), and since then have been using that due to the combination of direct and the larger print bed (even though I conceptually don’t like bedslingers due to the large footprint they have). And I had the Ender 5 too briefly to dial it in much.