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Can this cause delamination?

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Is that a "hole" all the way through the filament? If so, I'd send it back and demand a full refund. It's going to cause problem with under extrusion. The calculated volume of plastic will be completely wrong since all the slicers assume that the filament is solid all the way through. Sure, you could tweak your settings until the volume matches what it's supposed to be but you shouldn't have to. Plus, you're getting less plastic than you paid for.


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Even if it wasn't what caused your problem that's still shitty quality and they know it, they just want to get away with it. You should still demand a refund IMHO. If they're serious about their business and value their customers they should make it right.


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