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Weird filament curling in layer interiors  

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matthewm1970
(@matthewm1970)
Active Member
Weird filament curling in layer interiors

I'm not sure how to accurately describe the problem I'm having and can't find it in our 3D Printing Failures book.  My best description would be that threads of filament appears to be curling up within the interior of large layer prints.  It starts this way on layer 2 and by layer 3 it's significant enough to be globbing onto the nozzle.  

Small prints, such as benchy at 40 or 50mm length, have printed fine. But larger prints with signficant x/y area are having the problem.  I've attached a photo to help explain it.  I'm not sure where to start tweaking; should I adjust speed, acceleration, temperature?  

Thanks in advance for any help

Posted : 07/05/2020 7:05 am
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Weird filament curling in layer interiors

Good Morning Matthew, 

Is this also happenning with the pre sliced models, such as the prusa logo or the baterang? 

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 07/05/2020 8:46 am
matthewm1970
(@matthewm1970)
Active Member
Topic starter answered:
RE: Weird filament curling in layer interiors

joantabb - I don't have those; is there a place to download them? (I didn't find on the Prusa site download pages)

Posted : 07/05/2020 9:12 am
matthewm1970
(@matthewm1970)
Active Member
Topic starter answered:
RE: Weird filament curling in layer interiors

OK, I found the batarang model (here: https://www.prusa3d.com/printable-3d-models/ ) and am testing right now.  I also washed both my build plates, in case the PEI had gotten dirty/oily.  

Posted : 08/05/2020 6:19 pm
matthewm1970
(@matthewm1970)
Active Member
Topic starter answered:
RE: Weird filament curling in layer interiors

Batarang printed fine, and reprinting the original model that had trouble is also now printing fine.  More bafflement ensues around here - no idea why it failed so significantly before and the same is printing fine now, but happy that it is.  

Posted : 08/05/2020 8:25 pm
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