From what I understand the quality isn't there yet, I have seen a few 3D printed Warhammer stuff and it looked awful up close.
That being said it is one of those technologies that is rapidly advancing, so it won't be long. Certainly 3D printed terrain/scenery is here now.
I just hope the likes of Games Workshop are keeping an eye on it and have some kind of strategy, because I think once the technology to 3D print with the same quality of injection moulding is here, they are going to have a serious problem if not.