The purefil refill packs are wound filaments that are supplied without a spool. With this product, the purefil plastic spools can be refilled with new filament. This means that the empty spool no longer has to be disposed of and resources are saved. The use of high-quality raw materials creates a 3D printer filament that is particularly easy to process. Using a state-of-the-art manufacturing process, very low manufacturing tolerances are achieved, which leads to convincing printing results with all FDM 3D printers. Each coil is sealed in a high-quality bag. - Made in Switzerland - small diameter and roundness tolerances - easy to print Polyactide is a polymer that consists of lactic acid molecules, among other things.We currently have PLA filament 1.75 mm and PLA filament 2.85 mm in our range.A heated bed is advantageous for PLA filament, but not essential.We recommend using an air c.