NinjaFlex is a recently developed flexible, extrudable material for 3D printers such as the MakerBot, Airwolf, and RepRap lines of 3D printers. This material is a thermoplastic elastomer filament, 1.75 or 3 mm diameter, with a shore hardness of 85A. … [Read more...] about New material for 3D printing: a flexible filament