Christian Bagg was an avid outdoorsman when a tragic 1996 accident left him paralyzed from the waste down. With training as a machinist, he spent years attempting to invent a wheelchair that could withstand the rugged trails of the Canadian Rockies near his home in Alberta, Calgary. But two years ago, his basement experiments took a giant leap forward with the arrival of a 3D printer that dramatically accelerated his ability to test new components. Now, his invention has not only allowed him better access to the mountains, but also may change the way other people with debilitating injuries can recover. NewsHour Weekend's Christopher Booker reports.