Molecular Manufacturing

In the future it may be possible to manufacture arbitrary chemical compounds or atomically precise materials using open source processes.

Chemistry Molecular Printer: This article discusses a chemistry molecular 3d printer prototype also described in this paper

Nanofactory: Atomically precise manufacturing at macro scale is theoretical, however physics simulations have been performed suggesting the possibility, for example, of the atomically precise deposition of carbon atoms, using self-replicable tooling made of carbon hydrogen and germanium atoms. See Diamond Mechanosynthesis.