I’ve been repairing a Creality CR-10S Pro V2 and can’t figure out this persistent oddity. It prints spiral vases and benchies flawlessly, but regular 3D prints often have these pronounced bumps and thick whiskers sticking out. I think it’s more than just Z seam blobs, I’m wondering if it’s an issue with the wipe settings not working well in PrusaSlicer…

Here’s another example of the issue: https://i.imgur.com/ZHssQWI.jpg

I’m using Kaaber transparent PETG, printing at 215/210 nozzle and 75 bed. I know this seems cool for PETG, but this brand tends to melt and ooze at anything hotter.

Here are my PrusaSlicer retraction settings, they are the default for this printer:

https://i.imgur.com/RqrltUL.jpg

I tried slightly bumping the retraction to 6.5mm and 65mm/s, but it made no difference.

Any ideas what would cause this? I’m getting it while trying to print many parts of the honeycomb storage wall off printables.

  • skilltheamps@feddit.deEnglish
    2·
    1 year ago

    As many other stated, its nozzle ooze. When you travel the same path repeatedly, it will catch on previous ooze and build these diagonal structures.

    Besides what other wrote, I can recommend:

    • Try out how fast you can make your printer move, and travel as fast as possible. That gives your filament less time to ooze, and therefore you minimize the amount.
    • When travelling, do a very small Z-hop. Something like .1mm. That helps a bit to not deposit the oozed material along the way, but where you touch down again. If you make the Z-hop too high, it will start to create strings. So you’ll have to try and tune this value.
    • Generally try to slice in a way that minimizes travels. Even stuff like choosing an infill that doesn’t cross lines, and connecting those lines so that you print long and steady can help to keep your nozzle clean (I like gyroid with connected ends for that matter).
    • What also helps is to convert your printer do direct drive. That gives more precise retractions. What works well for me is direct drive with small retractions. I believe, not shoving the filament back and forth so much yields better quality. Maybe, because retracting a large amount pulls air into the hot-end, and I imagine it might not all come out perfectly again when continuing with the next perimeter.