This isn't metal:
BAE Certifies '3D Printed' Part on BAe 146 Jetliner | Aviation International News
"3D printing" sounds like a buzzword, somewhat misleading, it has virtually nothing to do with traditional print techniques, and I doubt it will revolutionize manufacturing overnight, for now it's just a niche thing. I suspect many jump on it to demonstrate how "innovative" they are, to be able to make a press release. Nevertheless as a technophile...why not. It may be worth exploring
I can't comment on carbon fibres in particular (the original question), but regardless of material, the promise to cut tooling costs seems very interesting, particularly for older a/c and hard to obtain parts today. That's a pretty big market (my immediate thought. So maybe not so much carbon fibre yet? But rather mundane things, like in the above example)