From an article at nanowerknews.com:
Three-dimensional printing allows extremely small and complex structures to be made even in small series. A method developed at the KIT for the first time allows also glass to be used for this technique.
As a consequence of the properties of glass, such as transparency, thermal stability and resistance to acids, the use of this material in 3D-printing opens up manifold new applications in production and research, such as optics, data transmission, and biotechnology.
The process is published in Nature (“Three-dimensional printing of transparent fused silica glass“) and also presented at the Hanover Fair.