molded to fit your hand, with all of the buttons exactly where you want them. Industrial 3D printing is already used to make custom, fully functional prosthetic limbs. [1] This ability seems amazing today. Who could resist giving out exact replicas of their face to friends and family as gifts? What child (or adult, for that matter) would not enjoy the ability to summon toys they designed out of a computer and into their hands? What is to prevent you from making a toaster that squeezes into that oddly shaped nook in your kitchen? Why shouldn't amputees have prosthetic limbs that match the rest of their body, or that have neon stripes with alternating flashing lights if they so desire? Yet, this amazing ability is also vulnerable to restriction through intellectual property law. Artists may fear that their copyright-protected sculptures will be replicated without permission. Toy companies will see trademark and copyright violations in toys flowing from 3D printers. The new toaster or prosthetic arm may infringe on innumerable patents. No one suggests that these concerns are unwarranted. After all, the ability to copy and replicate is the ability to infringe on copyright, patent, and trademark. But the ability to copy and replicate is also the ability to create, expand upon, and innovate. Just as with the printing press, the copy machine, and the personal computer before it, some people will see 3D printing as a disruptive threat. Similarly, just as with the printing press, the copy machine, and the