Fixing a person's broken heart thanks to a 3D-printed replica of their real one

Sometimes you can't mend a broken heart and just need to replace parts of it. However, the size and shape of peoples' hearts can vary quite a bit, making it difficult to use off-the-shelf artificial valves and other implants. Now though, MIT researchers can use a medical scan of a patient's heart to create a digital model that's then 3D printed out of soft plastic that 'can squeeze and stretch, similarly to a real beating heart.' — Read the rest