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FreeCAD is more than just a viewer; it is a full-fledged parametric 3D modeler. However, many users download it specifically to use its powerful import/export engine. 3d shape viewer download
What are you trying to open? (.STL, .STEP, .OBJ?) What is your operating system ? (Windows, Mac, Linux?) Are you 3D printing , or just inspecting a design ? Advanced tools for cleaning up and repairing 3D meshes