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How to tell when the PTFE coupler is bad

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So I've had my UMO for a few years now, and it's been having an increasingly difficult time pushing material. Last time I tried to print something, I couldn't really push any material through and have spent the last week trying to clean the nozzle and figure out what the problem is. I have never replaced the PTFE coupler, and I'm wondering if that is the problem, causing restrictions and also contributing to the under extrusion I was experiencing when I could still move material.

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This sound much like the problem I had recently. After a completed print the filament would get stuck and I had to take out the PFA tube and cut off the end of the filament to a taper and reinsert the tube back.

After a while it got tiring, so I replaced the PTFE coupler. It fixed the problem. Cutting open the old PTFE coupler revealed that it had formed a cavity which allowed the filament to expand, and thus get stuck in the PFA tube.

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