The model contains 5 stl files.

One blood pool model for extracardiac structural analysis, and 4 files for the myocardial segmentation.  1 file of the entire heart and then 3 files, (1,2 and 3) of the 3 slice method with the center slice aligning with a short axis slice and containing all valves. 

The heart model was designed to be printed in 3 slices; the localizer keys are designed to hold the following magnets:

If using Z450 or similar printer, take care to remove all powder before fixing.  Small vessels and cavities can be difficult to clear all of the powder.