Polymaker Panchroma Gradient Celestial PLA Blue-Purple 3D Printing Filament 1KG, Premium Gradient PLA, Easy to Print, AMS Compatible, Perfect for Figurines, Display Models and Fantasy Designs

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.