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The three file formats commonly used for 3D printing are OBJ, STL, and 3DS. These files contain the digital information necessary to produce a physical object through additive manufacturing. OBJ is an open standard that supports different types of data, while STL is specifically designed for 3D printing and provides mesh-based representation of an object's surface. 3DS is a proprietary format developed by Autodesk, which stores both geometric and material information about the object.