
I purchased three spools of this material to print respirators for local medical and emergency workers. Towards the end it started to print oddly, but I ran out and switched to another brand (limited by what's available as well as purchase restrictions during this pandemic) and I was chasing all sorts of under-extrusions, layer adhesion, temperature variations, and missing layers the last weeks. (Since then I've used about two pounds of other filament and struggled with it constantly.) I finally figured it out when I took my hot end apart and found that it was clogged all over - some had burned out, some were just clogged, and some formed a kind of viscous mush that stuck everything together. I don't know what they added to this thread but my Ender 3 hot end is now a total mess. Even the Bowden tube stuck together and burned in the hot end!

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