I had this issue. Ultimaker GB replaced the coupler (actually sent me a whole nozzle kit) and I took 20 minutes to replace the coupler with my heart in my mouth.
Fortunately although it is really fiddly, I succeeded without any mishap, and all your problems disappear. So I urge you to do likewise!
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cloakfiend 990
This is how i print now, 7 mins not too bad, i repeat myself a bit, but it sheds light on a few issues people may have with the PFTE coupler. Now ill admit i dont really know if im right in saying whats actually wrong but doing things this way bypasses any problems i would normally have kicking off a print with my visibly deformed coupler.
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