It’s not exactly Fabbing as we know it, but the World Intellectual Property Organization now includes an entry on printing live tissue. Yes, I mean punching out “mammalian cells” via an ink-jet process.
Evidently the cells are deposited in layers, much like 3D printing, onto an existing substrate. In some cases the substrate is itself printed, along with growth medium. Then the cells take over by growing and multiplying to develop into fully-formed tissue.