Public Knowledge has a research document looking at how intellectual property law might affect 3D printing, and how some industries might feel threatened enough to try and stop 3D printing -- kind of like some industries screwed around with Sony's mini-Discs, digital audio tape, and more recently with hi-def video.
...businesses (and industries) unwilling or unable to adapt may go to Congress to ask for increased IP protection for everyday items. Following the playbook of the recording and motion picture industries, they will also label 3D printers tools of piracy, and their users as thieves...
The document even has a cool title: “It Will Be Awesome If They Don't Screw It Up: 3D Printing, Intellectual Property, and the Fight Over the Next Great Disruptive Technology.”
Download the document and/or get more info here.