“The list of things that can be created with 3-D printers keeps getting longer: jewelry, art, guns, food, medical devices and, now, mouse ovaries. Scientists have used a 3-D printer to create a mouse ovary capable of producing healthy offspring. And researchers hope to create replacement human ovaries the same way someday. “It’s really the holy grail of bioengineering for regenerative medicine,” says Teresa Woodruff, who led the new research published this week in the journal Nature Communications.”