Polymaker Panchroma Gradient Silk Fire PLA 3D Printing Filament 1kg, Smooth Color Transitions, Shiny Silk Finish, High Speed Printing, Ideal for Home Décor, Toys, Cosplay, Miniatures & Gifts

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.