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The OBJ, STL and 3DS formats are popular file types used in 3D modeling and printing. OBJ stores geometric data in a human-readable format while STL is a binary format used for 3D printing. The 3DS format, on the other hand, is a proprietary file type developed by Autodesk that includes additional features such as materials, textures, and animations. These formats are commonly used to share 3D models between different software programs.