[SOLVED] cause: not enough cooling for overhangs

I increased cooling on overhangs from 60% to 100%, and decreased overhang (10-25%) speed from 100% of outer wall speed to 85%. Issue went away completely and it now prints nicely 👌

I’ve started printing parts for my voron 2.4, and it’s generally going well enough. The parts are looking pretty decent. But I’m having a hard time getting good results with overhanging sharp corners. They tend to warp upwards as seen in the photo on the left side. The prints stick well enough to the build plate and I don’t have any other warping or adhesion issues.

Is this because my cooling for overhangs is too much?

I generally print with no part cooling in an enclosure. Temps are 245°C on the nozzle and 105°C on the bed, using 60° fan speed for overhangs. I’m printing on a anycubic kobra 2 with azurefilm ASA.

  • corodius@lemmy.worldEnglish
    1·
    2 months ago

    You need quite the opposite, more cooling on those overhangs. As you are in the chamber, the heated air wont cause warping like outside an enclosure, so crank those speeds on overhangs. I generally run 80-100% on bridges anf steep overhangs. I do also slow down print speed on overhangs significantly to allow more cooling aswell

  • IMALlama@lemmy.worldEnglish
    0·
    3 months ago

    I printed all my parts on my old i3 clone inside a couple of cardboard boxes taped together. They weren’t pretty, but they were pretty functional. I did reprint my stealth burner and it looks a ton better than my first part, but in terms of function there isn’t a whole lot of difference. The nice thing with plastic is that you can always mechanically trim material if needed. Most of the Voron parts are pretty forgiving too and don’t have super critical dimensions.

    As for why your overhands are warping up, it’s likely your cooling as you guessed. ASA does not like big thermal gradients and fan + passive chamber heating will result in that. I printed basically all my parts with zero cooling and didn’t have any real issues other than the stealthburner. On that note, plan to print bedfan mounts at a minimum. Something like the filter is nice to have if you plan on printing much ASA or ABS. If you’re building a bigger 2.4 you might want both…

    • morbidcactus@lemmy.caEnglish
      2·
      2 months ago

      Definitely recommend checking out the nevermore max. i built the beta max and even with aquarium carbon it’s massive how much less odors my abs prints produce. Any sort of recirc filter is a good idea, I just like not having to change the filter media for a while.

  • rambos@lemm.eeEnglish
    0·
    2 months ago

    May I ask is ASA better than ABS for voton parts?

    Sorry OP, cant help with your problem, never printrd ASA

    • DreadPotato@sopuli.xyzOPEnglish
      1·
      2 months ago

      Both ASA and ABS are approved materials. ASA has higher heat defection than ABS, should be easier to print and it smells significantly less when printing.

    • Damage@feddit.itEnglish
      1·
      2 months ago

      To add to OP’s reply, ASA filament also tends to be higher quality, like more consistent diameter etc

      • rambos@lemm.eeEnglish
        1·
        2 months ago

        Good to know thx. Its been a long time since my last ABS print and I was just going to order some, but I guess ill try ASA this time