3D print flexible filament faster with PolyFlex by Polymaker. With the LulzBot Flexystruder Tool Head this specialty filament can be printed at higher speeds, reducing 3D print times compared to other flexible filaments. PolyFlex filament is produced to exacting tolerances, exhibiting consistent filament diameters for fine surface finishes. Features a unique blend of 90% thermoplastic urathane and 10 percent polylactic acid or polylactide, commonly known as PLA to provide stiffness, hardness, and flexibility. Apply glue stick (such as Elmer's brand)to a PEI print surface to make removing 3D printed PolyFlex objects easier. Hot End Temperature: 215C - 220C Print Surface Temperature: Off, when using a PEI print surface. Shore Hardness as reported by the manufacturer: 90-95 Shore A.