Dr. Ramille Shah and her team of researchers at Northwestern University have created a method for 3D printing graphene “nanoflakes” to build scaffolding with a biocompatible elastomer which might one day result in the ability to print working neurons. The liquid ink is extruded and solvents in the system evaporate immediately causing the structure to solidify instantly. Shah says the electrical conductivity of the graphene material not only contributes to the biological suitability of the lattice but it also allows for the growth of cells, which conduct electricity, such as neurons. You can read the whole story here: http://3dprint.com/66839/graphene-bioelastomer-inks/
Below is a look at a graphene lattice structure: