In this week’s Medical Discovery News: One of the major challenges to printing full-sized human livers is developing a way to print larger branched networks of blood vessels, as these are absolutely essential to the survival of the printed organ. But medical uses for 3-D printing, such as using it to model facsimiles of patients’ organs in preparation for surgeries, show that this technology has the potential to save lives. MDN is hosted by professors David Niesel at UTMB and Norbert Herzog at Quinnipiac University. Learn more at www.medicaldiscoverynews.com. The column also appears in the Galveston County Daily News.