With a little help from 3D printing and some robotics, four-year-old Emma Lavelle has overcome the limitations of a congenital disorder and can use her arms for the first time. Using a Dimension 3D printer from Stratasys, Inc., researchers at the Alfred I. duPont Hospital for Children in Philadelphia were able to create what little Emma calls her "magic arms." The device is a custom-designed robotic exoskeleton that enables her to conquer greatly limited joint mobility and underdeveloped muscles.