3D Inks Can Be Erased Selectively

3D printing allows for the efficient manufacture of complex geometries. A very promising method is direct laser writing in which a computer-controlled focused laser beam acts as a pen and produces the desired structure in a photoresist. In this way, three-dimensional structures with details in the sub-micrometer range can be produced for applications requiring very precise filigree structures such as biomedicine, microfluidics, microelectronics, or optical metamaterials.