See Paramount Cease and Desist Targets 3D Printer ‘Pirate’. See also my post White paper on 3D printing and the law: the coming copyfight. Congratulations, IP libertarians–IP is about to strangle the next new breakthrough technology.
Update: see Clive Thompson on 3-D Printing’s Legal Morass; The next Napster? Copyright questions as 3D printing comes of age; Fab@Home: The open source personal fabricator project; and RepRap: Free 3D Desktop Printer (h/t David Kramer).