Printing glass, it is possible

Researchers at the Massachusetts Institute of Technology (MIT) have made a breakthrough in 3D packaging material. They are able to print glass as if it were plastic.

The secret is in  a dual-heated chamber concept, with the top chamber heating the glass and lower chamber slowly cooling it to prevent internal stresses. The top chamber operates at approximately 1900°F, and funnels the molten material through an alumina-zircon-silica nozzle into its programmable shapes.