You misunderstand my use of the term "specialised". A 3D printer can print anything, barring some of the limitations outlined in the article. Most machines are

You misunderstand my use of the term "specialised". A 3D printer can print anything, barring some of the limitations outlined in the article. Most machines are intended to serve much more specific functions, and do so with great efficiency: I can print a hole in any shape I like, but if all I want is a hole, why shouldn't I just use a drill press?