The MIT Media Lab website states that "G3DP is a anâ€¯additive manufacturing platform designed to print optically transparent glass." This method will allow for the creation of complex 3D glass structures, in much the same way as current 3D printers work with plastic.
This is done by using a dual heated chamber concept. The one chamber acts as a kiln cartridge, operating at around 1040 °C while the other chamber serves to anneal the structures. See the video below for a detailed view of this process.
This process cannot compete with current glass production methods in terms of speed, but when it comes to creating more complex, intricate structures, 3D printed glass will allow us to push the medium to its limits.