Polymaker Fiberon PA6-CF20 Carbon Fiber Nylon Filament Black 0.5kg + Polymaker PolyDryer Filament Storage Box Only (No Dock) for 1kg PLA PETG ABS TPU Nylon

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.