https://phys.org/news/2018-07-carbon-components-d-printer.html

But there's a problem: Carbon fiber composite is expensive compared with aluminium or steel, as the manufacturing process is very costly and time-consuming. Composites consist of carbon fibers and plastic to be combined and processed to make the highly durable material. A separate mould or negative form is usually required for every single component, adding to the high production costs.

Producing carbon components without moulds