This specific 3D model, "Women Ring MTL 3dm STL OBJ FBX Details 3D print model 12", is an asset made available by "Unknown author".
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The license for this digital asset is "Unknown license".
STL (Stereolithography, filesize: 6.44 MB), OBJ (OBJ, filesize: 15 MB), 3DM (Rhinoceros 3D, filesize: 6.2 MB), FBX (Autodesk FBX, filesize: 2.61 MB)