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You may also be interested this post if you have time.. it will be helpful
Maker Steve’s 3D Printing Rules to successful 3D Prints
Two days in a row, my brand new Creality Ender 3 has had the coupler let go of the PTFE.
This is what I discovered Wednesday afternoon. Only 25% of my print was completed and I had about a dollar in filament, never to be used again. I typically use dikale 1.75mm filament because it is relatively inexpensive and provides consistent prints roll to roll.
It is worth noting the price dropped from $17.99 on dikale White PLA to $16.99 today. I consider that a bargain.
From afar, I knew I had a problem.
I could see the PTFE tubing disconnected from the Extruder assembly pneumatic connector, or coupler as we call them.
What a mess…
I had such dreams for that print..
So I cleaned it all up by trimming the excess filament.. and heated up the hotend, pulled the filament from the PTFE tubing to the hotend. Then I reinserted the PTFE, gave it a tug and went back to printing.
And today I found this…
I bigger mess…
Same problem.. 
At that point I didn’t trust the coupler any longer and went to my
Pulled a couple spare PTFE connectors
Again, I clipped off all the excess..
Looked at my pile of wasted PLA with the bad coupler..
And installed a new one.. Not so tight as to strip it.. just snug and a little more.
Heated up the hotend to get the remaining filament out of the PTFE going to the hotend.
Gave a slight push to get some positive pressure…
Then pulled out the filament in a smooth rapid motion.
I suspected this was not cut properly or wasn’t clean, you can see it is frayed a bit.
I trimmed off a bit with a razor to square it up. Alternately you can use a PTFE Cutter.
Applied a gentle pressure and let the blade do the work.
Good to go!
I inserted the PTFE in with a forceful motion and pulled on the first ring to lock it in place. I gave it a good tug because I don’t want this to happen again.
Back to printing..
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Be sure to check out my Ultimate Build Guide for Creality Ender 3
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Happy Printing,
Steve
Hi,,
Yes always cut the ptfe back that has been connected to a quick disconnect fitting, the fitting will bite into the pipe which after being removed a few times tends to not grip as well, will eventually require cut back.
Use a lot of this larger bore tube of drinks systems and get the same fault,,,always a bit messy with syrup and carbonated water.
Glad you solved it.
you need to use a clip or zip tie to keep the lock collar from being able to move.