Polymaker Metallic ABS Filament Metallic Green, 3D Printer Filament Heat Resistant 1kg - PolyLite ABS 3D Printing Filament, Strong & Durable, Dimensional Accuracy +/-

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.