Glassmaking began 4,500 years ago, in Mesopotamia and Ancient Egypt. The industry’s first products were trinkets, such as beads and pendants, cast from moulds and carved by hand. But craftsmen quickly worked out how to make more practical stuff, such as jugs, bottles and drinking vessels, by coiling strands of molten glass around a sand or clay core of appropriate shape, which could then be shaken or scraped out after the glass had cooled. Precise recipes for its production - the chemistry and techniques - often remain closely guarded secrets.

Additive Manufacturing of Optically Transparent Glass was developed by the Mediated Matter Group at the MIT Media Lab in collaboration with the Glass Lab at MIT.  G3DP John Klein, Markus Kayser, Chikara Inamura, Giorgia Franchin, Prof. Neri Oxman

Glass can be molded, formed, blown, plated or sintered; its formal qualities are closely tied to techniques used for its formation. Since those early days, many other ways of forming glass have been invented. These range from blowing forcefully through a tube to inflate a hot gob of the stuff, creating a hollow vessel, to floating it as a liquid on a bed of molten tin to produce perfectly flat window panes. But ancient wisdom often still has value, and now a group of researchers at the Massachusetts Institute of Technology have had another look at the coiling method, pronounced it good, and modernised it. Their principal updating is to dispense with the core. Instead, they have turned to the field of 3D printing—or additive manufacturing, to give its formal name. Objects of rare beauty, and possibly of great utility, result.

This show unveils a first of its kind optically transparent glass printing process called G3DP. G3DP is an additive manufacturing platform designed to print optically transparent glass. The tunability enabled by geometrical and optical variation driven by form, transparency and color variation can drive; limit or control light transmission, reflection and refraction, and therefore carries significant implications for all things glass. The platform is based on a dual heated chamber concept. The upper chamber acts as a Kiln Cartridge while the lower chamber serves to anneal the structures. The Kiln Cartridge operates at approximately 1900°F and can contain sufficient material to build a single architectural component. The molten material gets funneled through an alumina-zircon-silica nozzle. The project synthesizes modern technologies, with age-old established glass tools and technologies producing novel glass structures with numerous potential applications.

The G3DP project was created in collaboration between the Mediated Matter group at the MIT Media Lab, the Mechanical Engineering Department, the MIT Glass Lab and the Wyss Institute. Researchers include : John Klein, Michael Stern, Markus Kayser, Chikara Inamura, Giorgia Franchin, Shreya Dave, James Weaver, Peter Houk and Prof. Neri Oxman. 

A selection of Glass pieces will appear in an exhibition at Cooper Hewitt, Smithsonian Design Museum in 2016.  The full text version of Additive Manufacturing of Optically Transparent Glass will appear in the September 2015 issue (Vol. 2, Issue 3) of  3D Printing and Additive Manufacturing  (3DP+), under the Editorial leadership of Skylar Tibbits, Director of the MIT Self-Assembly Lab. Details and complete information on 3DP+ can be found  at here. The patent Additive Manufacturing of Optically Transparent Glass was filed on April 25 of 2014.

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Published on: August 21, 2015
Cite: "G3DP. Glass printing is now a reality" METALOCUS. Accessed
<https://www.metalocus.es/en/news/g3dp-glass-printing-now-a-reality> ISSN 1139-6415
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