to be fair that's the bit I'd be interested in anyway.

I don't envisage printing with carbon fibres anytime soon - just never been impressed with the stuff.
It's not conductive enough to worth bothering with and it's not any stronger. Just makes nylon a little stiffer.

But if the nozzle geometry helps extrusion speed up and it helps clean up retractions for, say flexible filaments and pet-g - Now there you've got a much larger potential market.

And I volunteer for testing :-)