Manufactured in-house by Prusa Polymers - We were not satisfied with the quality of filaments on the market. So we decided to make our own. As a part of Prusa Research companies group, we are the only 3D printer manufacturer with its own filament production. Premium-grade materials and thorough testing - The whole manufacturing process is closely monitored and tested – string diameter, color consistency, and mechanical properties – to make sure that every spool is perfect. High Quality you can check yourself - 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. 3. 02 mm Manufacturing Precision - 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.