Here’s a Kickstarter from a few months ago that put carbon fiber in PLA filament, making every desktop 3D printer one that can print in carbon fiber. But perhaps there’s something more here.

You might already know about PLA and its ease of use ... While the claimed benefits of carbon fiber filament sound promising, there are several reasons to avoid it Acrylonitrile butadiene styrene ...

The high amount of carbon fibers makes this ... material and lies about half way between PLA and ABS in terms of temperature resistance. Yet, PETG filaments are fairly undemanding to the printer ...