the_schire 3 Report post Posted August 19, 2017 in How to tell when the PTFE coupler is bad 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. Share this post Link to post Share on other sites
droopas 0 Report post Posted August 20, 2017 in How to tell when the PTFE coupler is bad 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. Share this post Link to post Share on other sites
Dim3nsioneer 361 Report post Posted August 20, 2017 in How to tell when the PTFE coupler is bad Do you have a picture of that cavity by accident? That would be very interesting to see. Share this post Link to post Share on other sites
the_schire 3 Report post Posted August 21, 2017 in How to tell when the PTFE coupler is bad Update, turns out it was the nozzle. Some how it got so clogged that I couldn't even blast out the gunked up material with a torch. Soo... I grabbed the smallest drill bit I have and made myself a 1mm nozzle. Prints faster than ever now Share this post Link to post Share on other sites
