$38 Mechanical heart Low-poly 3D model by a757374307. Available on CGTrader with 596898 polys and 433495 vertices. Check it out on CGHub.
Native Formats: MAX (Autodesk 3ds Max, filesize: 19 MB)
Exchange Formats: OBJ (OBJ, filesize: 12.2 MB), FBX (Autodesk FBX, filesize: 20.4 MB), SKP (Sketchup, filesize: 34.5 MB), STL (Stereolithography, filesize: 28.5 MB), 3DS (3D Studio, filesize: 14 MB)