Polymaker Panchroma Matte PLA Filament Refill 1kg, Earth Brown | Spoolless High Speed 3D Printing Filament 2.2lb, Compatible with Bambu Labs & FDM 3D Printers, Clog-Free for Reusable Spool

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.