These printers will someday be producing complex -- and controversial -- human organs . Their precise design will create vascular systems required to make organs viable . Doctor : ` ` It has the potential for being a very important breakthrough '' Researcher : This will become a major ethical issue by 2016 .
3-D printers may someday be producing complex -- and controversial -- human organs . Their precise process can reproduce vascular systems required to make organs viable . Doctor : `` It has the potential for being a very important breakthrough '' Researcher : Bioprinting will spark a major ethical debate by 2016 .