. >> across the country in los angeles, liz and cal von hasseim create in the sugar lab. >> it spreadsery fine layer of sugar. it paints with water, wherever that model exists at that cross-section and then it spreads another very fine layer of sugar and it paints the next cross section from the very bottom to the top layer until the whole model is built. and it is totally a magical process. >> then comes the fun part. >> we calls call this the excavation station. that's when we clean off all the sugar that's burying the model now. >> that's like the mow delicious air i've ever breathed. >> it's like you annihilated some sections of it here. >> i know how to get rid of these damaged goods. it's delicious! >> all right, kosta, what did 3d printing taste like? >> it tasted dry and sugary. but this is the most importantly, this is a 3d printed heart valve, children who have heart disease, 40% of them die. and this little guy is going ochange that about ten years away. >> is this the scaffolding that the cells go on? >> not even scaffolding. the cells are infused in it. >> oh yeah. >> what