Not a CF man, but I assume that some of the Carbon fibers are laid/ arranged to lie N/S and others E/W, for example ? The earlier "3D Printers" may only be able to use/ extrude their plastic on one direction ( say down ) from the print head. That is a start.
Some, at least, of the thoughts and considerations will transfer to a "proper CF 3D Printer" perhaps sooner than otherwise. And a suitable, "strong plastic" might be developed as an alternative.
Early digital cameras were all B&W until the Bayer filter made colour photographs practical and cheap enough to be unavoidable !
"Wet Plate" processing was still taught for regularFleet St. use in 1945.