The model is a mesh fixed, sliceable and printable version of the CT scan published by University Medical Centre Groningen in the Netherlands. The model includes the chambers, vena cava, aortic root, aorta, all valves, papillary muscles and endocardium. The original files can be found at sketchfab:

https://sketchfab.com/3d-models/cardiac-anatomy-external-view-e8e8c6685e82474d8393693fd0646dc7

If you use the model be sure to leave a shout out over at the link above. The work done by UMCG on making anatomy available for 3d modelling/visualization is amazing. They deserve all the support and credit you can give.

Even though the model is 3d print ready it is in inches. Please scale the model by a factor 0.3937 to get it accurate on a metric scale.