Yes, that's always been my nagging concern about 3D printing. Sure, it can print any single thing, but nearly every machine is made up of multiple parts. So eit

Yes, that's always been my nagging concern about 3D printing. Sure, it can print any single thing, but nearly every machine is made up of multiple parts. So either there's a set of construction machines down the line from the 3D printer, or 'some assembly required'. The related consideration is that each part of a constructed item has to be printed separately (and probably serially). Another issue that occurred to me when typing the earlier comment was, what about the inside of a hollow piece. I know there's camera+software setups that can generate a CAD-like model of anything based on a set of photos, but how would they determine internal structure. Seems like those systems would have to be augmented with an additional, small flexible camera that can image the inside of the object.