I have to say that I was shocked after I watched the video, how do they create all those human organs? Although the doctor shows some process in the video, I still do not understand how do the just use a normal printer, and just print a human organ. Also what is the problem that hamper these technology to be commonly used, and what are the differences between the human organs and the artificial organs? What are the side effects of replacing a artificial organs?

PS: http://men.webmd.com/news/20060523/lab-grown-replacement-penis-in-future (very interesting article).