Polymaker Fiberon ASA-CF08 Black Carbon Fiber 3D Printing Filament 3KG, UV & Weather Resistant, High Rigidity, Heat Resistant, Easy to Print, Functional Parts & Prototypes, 6 Vibrant Colors

The most engineering-minded consumer brand in this space. Polylite is their everyday PLA, PolyMax adds impact resistance, and PolyWood nails the timber look. They publish data sheets and actually explain what's in their formulations.