I disagree somewhat. While it's not a traditional 3D printer, it may as well be. It's essentially CAD software for DNA molecules, which automatically outputs self-assembling DNA structures which combine to create the desired formation of molecules.

Also, its creators use the word "print" frequently:

“We can now ‘print,’ molecule by molecule, exactly the compound that we want,” says Steven Armentrout, the principal investigator on the NSF grants and co-developer of Parabon’s technology.

I submitted another article on this a few days ago that has more details:

http://www.kurzweilai.net/automated-drug-design-using-synthe...