this post was submitted on 15 Sep 2024
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Print fails with "frayed" ends (feddit.org)
submitted 1 month ago* (last edited 1 month ago) by i_like_water@feddit.org to c/3dprinting@lemmy.world
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Hi, I've tried to print a model plane for my father. It's this model, using this LW-PLA right after purchase.

As you can see in the image of this post, the print is going well until it reaches a certain layer, where the filament does not get deposited properly for the entire layer, only intermittently. The following layers then, of course, have the same problem and I get this failed print with these "frayed ends". Additional attempts failed the same way at a similar layer count.

If someone has some experience with lightweight PLA (LW-PLA) and knows what can be done to solve this, I and my father would greatly appreciate the help.

Thanks in advance.

Edit: Additional info: I'm using the PrusaSlicer files from the linked page. Edit2: The printer is Prusa Mk4.

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[–] MyTurtleSwimsUpsideDown@fedia.io 3 points 1 month ago

Something is stopping the extruder from extruding and the “fraying” is just little oozes of filament catching on the layers below.

It could be mechanical, but if it is always at the same exact layer it is may be something to do with the geometry and the slicer.

Make sure you have thin wall detection on, so it will fully print walls that are narrower than the extrusion width.

Turning retractions off might help. I’ve never worked with LW-PLA but it could be that those internal pillars getting farther from the shell are causing a retraction that jams the extruder.

Others mentioned feed, make sure your spool is not catching on the spindle. I had this issue with a roll of TPU that was too wide and it kept getting pinned when I closed the filament door. It would print fine until the tension was too much for the extruder. Then it would look exactly like this.

[–] Tokugero@lemmy.world 1 points 1 month ago

Something I haven't seen suggested yet that has caught me up: a bad sdcard can corrupt an STL at a layer height and lead to this type of fault.

Try swapping the card while you're testing other things to see if that helps at all.

[–] Stampela@startrek.website 1 points 1 month ago

I’m thinking it looks like the print gets to a spot where it can get faster, and your hot end can’t keep up with the temperature required by that filament, causing under extrusion. If my guess is correct, it would show on a small test print (same settings) where you get looooong straight lines to allow for speed. And would disappear by slowing down. Since it looks like a relatively expensive filament I suggest you wait for more feedback before trying my test, just in case I got it wrong and my test would waste some filament for nothing.

[–] faebudo@infosec.pub 1 points 1 month ago

It looks like there are multiple layers printed without feeding filament, which causes these frays to build up. Could it be that the filament clogs after this layer? Or do you see that filament still properly feeds later? This could happen for example due to heat creep and the filament getting too warm/soft in the extruder to properly feed or you trying to feed too fast.