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 stimuli, giving them features such as electrical and thermal conductance, magnetism and electrochemical storage. But 3D printing using plastic, metal or something else entirely isn’t new. What Tech re-searchers have done differently is use polymer nanoco