The ABC article seems a bit more informative: http://abcnews.go.com/US/teen-builds-baseball-throwing-prosthetic-arm-father-injured/story?id=53683928 http://abcn

The ABC article seems a bit more informative: http://abcnews.go.com/US/teen-builds-baseball-throwing-prosthetic-arm-father-injured/story?id=53683928 http://abcnews.go.com/US/teen-builds-baseball-throwing-prost... This kid designed CAD models and printed two entirely different prosthetic arms: one to use a Switch controller one-handed (with the remaining good arm, obviously) and one for throwing a baseball. They clearly both serve their purpose pretty well. He's enabled at least two use cases that his dad was unable to do with his existing commercial prosthetic arm, so I'd say it's more than a 'cute story'. Looks like they used an i3 Duplicator Plus which is a $350 machine. I have a near-identical model myself (non-plus version) and the prints are fine, though it can take a lot of fiddling/calibration to get there.