The Purefil Refill Packs contain wound filament that is delivered without a spool. This product allows you to refill the Purefil plastic spools with new filament, eliminating the need to dispose of the empty spool and conserving resources. By using high-quality raw materials, a 3D printer filament is created that is particularly easy to process. A state-of-the-art manufacturing process achieves very low production tolerances, resulting in impressive printing results with all FDM 3D printers. Each refill pack is sealed in a high-quality bag. - Made in Switzerland - low diameter and roundness tolerances - easy to print. Polylactic acid is a polymer that consists, among other things, of lactic acid molecules. Currently, we offer PLA filament in 1.75 mm and PLA filament in 2.85 mm.