ZPrinting, was developed at the Massachusetts Institute of Technology n 1995. As in many other rapid prototyping processes, the part to be printed is built up from many thin cross sections of the 3D model. In ZPrinters, an inkjet-like printing head moves across a bed of powder, selectively depositing a liquid binding material in the shape of the section. A fresh layer of powder is spread across the top of the model, and the process is repeated. When the model is complete, unbound powder is automatically removed. Parts can be built on a ZPrinter at a rate of approximately 1 vertical inch per hour. The company that was created around this technology, ZCorporation o ZCorp, was acquired by 3D Systems in 2012.