The prototype "3-D Printer" can copy virtually anything...in three dimensions. Just think of the applications for space colonies, research stations or exploratory vessels. No need to stock spare parts, you could simply "3-D Print" a new one. (I bet the Apollo 13 astronauts would have loved to have one aboard. Maybe they'd have been able to make their Moon landing.)
Yeah, they call it a 3-D Printer. I call it a Replicator.