I have a DXC2 extruder (which I really like after figuring out the firmware coding change and issues with cutting filament) but the Bowden connector failed. I searched and see several work-arounds for this which require printing a different cable chain riser, one with a pass-through bowden connector (great idea). But then, I got in touch with tech support from Phateus.com regarding this. I got immediate turn-around within an hour or 2, sent in a video showing the complete failure of the connector to hold the tube, and they are sending me replacements. THAT was all resolved within a few hours, I was impressed. But it is shipping from China. They even sent a video of how to remove the bowden tube connector from the DXC2 extruder, which I had attached.
I did see one post where someone talked about simply replacing the PTFE connector but left no details.
I was going to print up the cable riser bowden tube workarounds, but then I looked at the connector I had removed. I ordered this bowden push-in connector from Amazon, which looks pretty standard so far as push-in connectors go:
It has a rubber piece on the bottom, which did not tightly wedge the connector in place, and it was too tall. I removed the rubber piece, and ended up filing the metal ridge on the bottom to the points where I was able to push it in: flush fit (actually took some force inverting it on my table and pushing). It holds the PTFE tube just great (first try anyway) and looks good. And I have 49 more of them if/when this one fails 
. Of course, I have the actual replacements coming from China as well due to very fast tech support.
Iām posting for several reasons:
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Phateus tech support was great and I have replacements being sent, and anyone else would likely be treated as well,
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Got 50 connectors from Amazon that can be altered to work like the original, and then you will be good forever with this issue, and avoid other work-arounds
Hope this helps someone!