Hi, thanks for your response.
I tried it but still it starts to come loose after a few minutes. I believe I have a problem with the extrusion, the material gets stuck in the part above the nozzle and pushes the plastic tube out.
I've tried to increase the temperature to 220 (PLA) and to decrease steps per E, but its just a matter of minutes before it comes loose again.
edit: i noticed i wasn't so clear the first time, it didn't come loose at the extruder wooden weel but at the part where it gets melted.
Just push it in all the way and pull back.
The small round piece should come back a bit with it.
Don't push the small round piece back down, that will release it again.
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