I think this can be caused by a filament that requires dehumidification .
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Yup, looks like filament that took on moisture. Stick it in a bag with some silic get packs or a food dehydrator
I third this. Though, I recommend being careful with the food dehydrator, sometimes, they don't go low enough heat wise. Sometimes, the thermostats say one temp and it goes above at the top of the stack. generally, it should be tried at a little less than half the printing temperature (technically, below the glass transition temperature.).
also, it should be kept in there for some time to allow the moisture to equalize out. I usually put desiccant packs in the top to recharge them and store them with the filament.
oven with the door slightly open works too
*on warm, don't melt the filament lol
yeah don't accidentally a filament donut
You won't believe this 3D printing hack: How to print a 2kg donut in 20 minutes with solid infill!!!
Yup, looks like filament that took on moisture
I think that filament is very wet and needs to be dried immediately.
I'm surprised this filament isn't a liquid at this point
Some filaments absorb moisture and are more susceptible than moisture problems than others, sometimes it's worse from color to color and brand to brand.
Store filament in a dry box to prevent this, and use a food dehydrator to fix this
Don't put your filament in the oven you will ruin both the roll and your oven!