The material is very cool, but I'm almost more interested in the progress in 3D nanofabrication this shows - "printing" material in 3D by selective solidification tends to be pretty slow, as you need to move around like a 3D printer head instead of one-shotting an entire layer like in 2D lithography.<p>The fact that they have made a millimeter scale version of their design instead of a small demo that looks cool under an electron microscope is very impressive! The method is pretty clever too - 2 photon absorption works only where the light is focused (and therefore high intensity). They use a lens array to create 49 focus points, allowing them to parallelize the printing of the repeating grid!<p>Scalable 3D fab could have fun implications for materials like this, and for chip-scale photonics.