Glass, one of the most useful materials at our disposal but one of the hardest to handle, has been a final frontier of sorts in the world of 3-D printing. Even as approaches to printing materials like plastics, polymers, wax, ceramics, and metals, have been increasingly refined, glass has been mostly relegated to crude attempts to form with digital printers that approximate a glass effect. That may be about to change. Driven by the transformative potential that 3-D printed glass could have in art, architecture, medicine, aerospace, communications, safety and security, and more, researchers and engineers, are making progress in overcoming the inherent obstacles to 3-D glass printing (3DGP). Years' worth of experimentation and invention has led to the groundbreaking innovations we have seen this summer - Micron3DP, an Israeli company that designs and manufactures 3-D printer parts, announced a prototype of a new high-temperature extruder printe in June, and MIT recently announced the 3-D hot glass printer developed by the Mediated Matter Group in collaboration with MIT's Department of Mechnical Engineering and MIT's Glass Lab.