yes - there isa company that is both producing a dual extrusion printer and carbon fibre filament.
I think they reckon it's about 50% as strong as moulded parts.

http://www.telegraph.co.uk/technolog...ext-month.html

http://www.forbes.com/sites/tjmccue/...fiber-printer/

Looks cool - you can bet there'll be a carbon fibre filament generally available soon :-)