A company called Not Impossible Labs has come up with one of the best uses for 3D printer technology we've ever heard of: printing low-cost prosthetic arms for people, mainly children, who have lost limbs in the war-torn country of Sudan. The project was the brain child of Mick Ebeling, founder of Not Impossible, a company dedicated to "technology for the sake of humanity." The arms they developed are inexpensive enough to be available to anyone who needs one, costing around $100 to produce, and can be printed in about six hours, reports Time's Harry McCracken. The key to Not Impossible's success so far has been this linking together of individuals that share a passion for the open source and maker community ethos.