@JeffRand I feel for you, but starting from where you are now (and after all, that's where you are!) your best bet is to buy the Bowden fitting elsewhere and stop trying to get Cobblebot to behave in a reasonable manner.

BTW I can think of only one reason why they haven't released the firmware, and that's because they don't yet have a working non-prototype printer – i.e. even they can't build a working printer out of the bits they've sent you all. That would also explain why there is no evidence, at all – not a single photo or video – of a production cobblebot. It would also explain the lack of full build instructions. Note that this is my opinion – you are free to form your own.