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STL files are everywhere. When there’s something to 3D print, it’s probably going to be an STL. Which, as long as the model is good just as it is, is no trouble at all. But sooner or later ...

Using these free software, you can easily view a variety of 3D files. Some of the commonly supported 3D file formats by these viewers include OBJ, 3DS, DAE, FBX, PLY, IGS, IFC, STEP, STL ...