About this 3D model
Used openSCAD to cut the heart from the dragon model. OpenSCAD didn't want to work with the full resolution version of the dragon so I trimmed it down a bit in meshlab. (dragon_lowres_ascii.stl) I used the heart thing http://www.thingiverse.com/thing:6190 to clip the heart from the original model. Then clipped the bottom of the heart so it could be used as the heart for the final print.