This specific 3D model, "decorative pattern ready for 3D printing 3D model 170", is an asset made available by "Unknown author".
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STL (Stereolithography, filesize: 42.2 MB), OBJ (OBJ, filesize: 71.5 MB), FBX (Autodesk FBX, filesize: 22.5 MB), MAX (Autodesk 3ds Max, filesize: 69.6 MB)