3D printing is helping to create a much more customizable medicial world, so when you think about a 3D printed crutch you most likely think about how customization will likely come into play. That's not what makes one company so interested in 3D printing though. Better Walk makes 3D printed crutches. They use the technology for more of a way to change the traditional design of the crutch to make it more comfortable, rather than to customize them for patients. More details on these crutches can be found here: http://3dprint.com/8053/better-walk-3d-print-crutch/

Here is a picture of a Better Walk Crutch: