Researchers at Northwestern University have developed an artificial ovary using 3D printers and gelatin, which may help pregnant women with fertility problems. The material is strong enough to hold eggs, but is porous enough to ovulate and form blood vessels. Artificial ovaries have been successful in mice. When the 3D printed ovary is implanted into the infertility mice, these mice are not only able to ovulate, but also have healthy pups. The researchers believe that more needs to be done before the ovaries are successfully used in humans, but their goal is to enable women who are infertility due to cancer treatment to have children in the future. The 3D printer has created many other useful body parts, including ears, kidneys and hands.