Polymaker PETG Army Brown 3D Printer Filament 1kg, High Speed PETG up to/s, High Strength New Formula, Excellent Layer Adhesion, Warp Free, Compatible with Most 3D Printers

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.