Nanovaccines that can change in response to mutating threats...
I feel like I have understood the importance of 3D printing for the very first time which makes sense, I have tended to be a little slow.
As to the precision of Carbon3D, the best I can figure based on their recent publication is printed layers as small as 1µm. That's pretty darn good resolution for a 3D printer.
I found this whole thread very exciting, I as down-voted into oblivion very quickly so I stopped sharing my thoughts but my mind ran on for a while...
Self-healing machines, buildings and devices also sprang to mind.
Basically, if the printer is small enough to be a part of the object and there were a way of determining what it needs to print then the object need never be broken (for very long) in fact: the object doesn't even need to be defined as a cup, a pair of trousers, a bicycle. If the printer can embed itself into anything it prints then it could literally morph according to a given requirement.
...I'll stop now.