Science fiction offers a lot of ideas for creating new body parts on demand, and the advancement of 3-D printing (also called additive manufacturing) is slowly translating this idea into science fact. Today, the 3-D printed anatomic models created from patient computed tomography (CT), magnetic resonance imaging (MRI) or 3-D ultrasound imaging datasets are used for education and to plan and navigate difficult procedures. These models are used to teach about complex or rare cardiac or congenital conditions that up until recently could only be seen using examples extracted from cadavers.