Polymaker Matte PLA Filament Charcoal Black 1kg 3D Printing Filament, PolyTerra 3D Printer PLA Filament

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.