When Jiang Chengyu was born in 1987, a "printer" referred to a machine for reproducing documents -often at a mind-numbingly slow pace.

Few could have imagined that, only a few decades later, a new generation of printers would be used to create not documents but teeth.

Jiang's improved 3D printer, capable of producing prosthetic teeth, is one of the many ideas that got its start at Zhongguancun's Dream Lab.