What material where you printing?
It looks like woodfill if a see that stuff on the top.
In that case it could be that the fibers of the material have clocked up your nozzle.
If the nozzle is stuck enough the pressure will start to push the material out towards the top and this happens.
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swordriff 119
Which Feeder do you have, original?
Which ptfe coupler, original?
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