Tree up can't just make it with your hands that well. this is a knee meniscus. these are ears. these are human ears. >> and cookies. >> these are cookies that look like a snowflake that will be more difficult to make if you had to use a cookie cutter. >> these are busts of a human head. >> without fur tour adieu let's show people on the computer screen. we are going to printout a human ear using tissue. >> the first thing you need is a model. some sort of 3 dimensional image that you can develop away to deposit material. in this case this ear is scan withed from a human patient. we can take an...