Polymaker Panchroma PLA Filament, Gradient Luminous Rainbow 3D Printing Filament, 3D Printer PLA Filament, Fit Most FDM 3D Printers, 1kg Spool (2.2lbs)

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.