Despite the technology being around for a longtime it's only now that development and enhancement is really starting to takeoff and I've no doubt it will ultimately mature to a point where structurally critical items can be manufactured.
The real benefit comes from not having to hold an inventory of 1000's of small components. For example, if an overhead locker handle gets broken, rather than having to check stock or order one in - just print a new one from a stored blueprint file....a small royalty fee to the original designer/manufacturer and bingo - job done!
Perhaps a simplistic view but in 10 years it wouldn't surprise me if this was the norm.