This footage by Mediated Matter Group at the Massachusetts Institute of Technology illustrates their first transparent glass 3-D printer. Called G3DP (Glass 3D Printing), the printer has dual heated chambers. The upper chamber, a “Kiln Cartridge,” operates at 1900°F; the lower chamber heats then cools to soften the glass. Watching the process is both soothing and satisfying. Via Gizmodo