Whilst working on my Bambu x1c extruder a little part dropped from somewhere and I’m blowed if I can find where any help please
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Thanks for posting the clear photos, it really helps take the guesswork out of answering your question.
It looks like that interior PTFE tube coupler may have snapped off from it’s mating side. This is what it should look like. They include this with the cable chain assembly. I do not believe they sell it separately.
This is the dual side version that you can buy in sets of 3.
You can buy replacements here on the Bambu Site but scroll down for other options on Amazon. Bottom line is that you may want to treat this more like a consumable and keep some in your kit.
If you don’t have the Bambu version, don’t sweat it too much. Any 1.75mm Pneumatic Connector will work. I use them all the time in both maintenance for my P1 as well as mods I’ve made on my filament dryers as well as mods I’ve made for dry boxes. The key is to use the blue clip which locks the spring in place.
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If you want to find variations of these kinds of connectors for you toolbox(always handy to have some on hand), then I suggest looking at this Amazon search.
https://www.amazon.com/s?k=Pneumatic+Connector+Fitting
Now having said that, you’ll find that their are two different outer thread diameters used in 3D printing. PC4-M6 and PC4-M10. Each can have it’s purpose so having both on hand can be useful. I purchased this variation early on to figure out which one was best suited for modding.
https://www.amazon.com/SIQUK-Fittings-Straight-Pneumatic-Connector/dp/B07L8R4SMG
The upside is that they give you enough sample PTFE tubing to make experimentation a breeze and of course if you want to employ some good’ol Yankee Ingenuity in modding your rig. 
The downside is that this kit is missing the clips. But guess what? Someone thought of that too. Any one of these will work.
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PC4 Pneumatic fitting/PTFE connector lock clip by QJeezy | Download free STL model | Printables.com – I tested this one myself and it’s the one I’ve been using.
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PTFE Clip by 3DTechInsider | Download free STL model | Printables.com
Just make sure you print these replacements out of a higher temp filament if you want them to last, but if they are PLA and don’t last, who cares? Just print more.
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