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Filament stuck in hot end Isolator coupler umo

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Hey guys,

I have one big problem, very often the filament stuck in the hot end Isolator coupler. It looks like the filament where compressed and create a seal and print is gone, i had to disassemble the Head and remove the seal.

I replaced every part of the head including the coupler but it still happens and i don't know why.

Can anybody give me a advice how i can fix it ?


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Couplers compress overtime and dies, changing the size leaving a gap for the filament. You probably have a) a dead coupler or b) a china coupler with the wrong size.

Also propably you have black goo on the lower part of the barrel/peek. If so, you need to take out the coupler and do atomic pulls of the goo that it's between the coupler/peek and get a new ptfe coupler.

Make photos it's easier.

Example of black goo dead coupler https://ultimaker.com/en/community/18531-multiple-problems-see-picture#reply-128039

Edited by Guest

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