Our most popular exotic material, Protopasta Carbon Fiber Composite HTPLA  is a combination of milled carbon fibers and high-performance PLA. Resulting 3D prints made with our Carbon Fiber HTPLA are demonstrably more rigid, providing excellent structural strength and layer adhesion with very low warpage. The embedded carbon provides a beautiful matte black finish with a slight sheen, resulting in 3D prints with exceptional accuracy, finish, and performance!