This is an oldie, over 16 months old, but goes to show just how awesome 3D printing already is. These legs sell for about 10% of what traditional Prosthetic legs costs, and can be customized for the individual, with whatever designs they would like. Check it out:
http://moodle2.greshamhs.org/mod/for...cuss.php?d=533
http://moodle2.greshamhs.org/pluginf...ic_630x420.jpg