<https://community.ultimaker.com/topic/19249-how-to-tell-when-the-ptfe-coupler-is-bad/#comment-186726>
<http://schema.org/text>
"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. \n\nAfter 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. "
<https://community.ultimaker.com/topic/19249-how-to-tell-when-the-ptfe-coupler-is-bad/>