Mechanical engineering researchers at Michigan Technological University have created a way to make a 3D-printable nanocomposite polymeric ink that uses carbon nanotubes (CNTs) — known for their high tensile strength and lightness. This revolutionary ink could replace epoxies — and understanding why its properties are so fantastic is a first step toward its mass use. 3D printing, also known as additive manufacturing, is more versatile and efficient than casting. It adds a material with precision, often in complex geometries, with considerably less excess to  cut away. Adding low-dimensional nanomaterials such as CNTs, graphene, metal nanoparticles and quantum dots allows 3D-printed materials to adapt to external st