Prusament PLA is a filament in-house made by 3D printer manufacturer Prusa Research. The whole manufacturing process is closely monitored and tested – string diameter, color consistency, and mechanical properties – to make sure that every spool is perfect. We believe the industry standard of 0. 05 mm isn't sufficient for perfect 3D printing. Instead, we 0. 02mm precision and highly-consistent colors in our filaments. We are the only manufacturer that gives customers the option to fully inspect parameters of every filament spool. Just scan a QR code on the spool to see all details online at president.