Polymaker Polymax Tough PLA 3D Printer Filament 0.75kg Purple, PolyMax 3D Printing PLA Filament Purple, Tougher Than PLA+ 3D Filament, High Impact Strength for Functional Application

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.