i feel myself lucky to see 3d printed models(not aircrafts), in real life and work upon it. Its still very rare in india and very expensive.
The only drawback is you don't get smooth curves.
(but wont take time to be rectified)
At present we may need a bit sandpaper for RC
The models i have seen had materials which seemed a bit heavy for RC, but alternative always exists.
In RC, it has got lots of scope. And i am sure many of us would be printing our model within a decade.
The technology has clear cut way in overcoming the present modelling techniques.