Molecular 3D printing is something entirely different from 3D printing (living) tissue. DNA molecules, while themselves being gigantic in comparison to your average non-protein molecule, are tiny, tiny, tiny structures compared to a single cell, which in turn isn't much when looking at entire organs.
What you probably heard was of 3D printing a matrix, a skeleton if you will, on which the tissue for noses and ears could grow until you actually have something that a surgeon could sew on. But that's not actual 3D printing of (living) tissue, more like forming a chickenwire basis for your model train landscape that you then cover with paper maché (which would represent the living tissue in this analogy).
3D printing of molecules is still science fiction. It's not entirely unthinkable, but whether it's ever going to be practical when you have so many other tools to create custom DNA is an open question.
Seeing through walls - hogwash. Maybe with a ground radar, but that's hardly practical. Forget "sonar" or thermal (let alone IR) to locate humans behind an actual wall. There may be constellations possible where you have some sheets of plastic mounted on a frame that happens to be transparent to thermal radiation, but when we're talking of conventional construction materials, there is no "see through magic". It may be possible to detect whether a room is slightly warmer than some other to conclude that there may be humans hidden inside, but even that is a stretch - unless you know for sure that there are no other heat sources around.
Drones being "science fiction" - I don't know. Even as a kid in the late 1970s/early 80s I thought about rigging a camera to a model airplane. It wasn't a practical idea for a whole host of reasons, but at least in principle the necessary technology was already there. It just happened to be too bulky and heavy (or too expensive in the analog age), but not entirely unthinkable. What has changed are batteries increasing their power densities massively, electronics becoming incredibly cheap and pervasive to the point where you can put them at virtually no cost into toys, and the development of small and light digital cameras. Combine the three trends and you get remotely controlled flying cameras.
