Extremely impressive! A group of researchers at the Technical University of Denmark have a whole lab integrated under an electron microscope. Two manipulators and a turntable, and MEMS tips for the manipulators. And they can build 20-nanometer tips on the MEMS tips by using the electron beam to deposit metal atoms. That's small enough to move individual molecules around.
It's things like this that cause CRN to warn that exponential general-purpose molecular manufacturing could become a reality in as little as five years if somebody started a full-speed project today. The major gating factor is conceptual, not financial or technical. So someone will achieve it, and the rest of us will be clueless and unprepared.