Polymaker PolyLite Clear 3D Printer PETG Filament 1kg, Legacy PETG Formula, +- Dimensional Accuracy, Reliable Everyday Filament, Strong Layer Bonding, 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.