Download and install FreeCAD, a free, open-source computer-aided design program available on SourceForge. In addition to being a fully functional CAD modeler and designer, FreeCAD can import and export a variety of formats, including OBJ and DXF. Open your OBJ file in FreeCAD, click "File" and select the "Export" option. Pick "DXF" from the list of file types.
"OBJ" files are used by 3D modeling programs to save texture maps, 3D coordinates, and other information for developing 3D graphics. You can import or convert these files into the popular "DXF" format, designed by Autodesk for its AutoCAD-drafting software. Though AutoCAD does not support OBJ files natively, there are plug-ins and other converters available to do this task for you. The DXF format is one of the most universal 3D modeling formats available.
Install MeshLab, a free, open-source program designed to view and edit 3D meshes and models. You can also use MeshLab to input OBJ files and output to DXF or a number of alternate formats. Open your OBJ file and click the "Save As" option under the "File" menu to export. Select "DXF" from the list of file types.
Sign up for the 10-day free trial of OBJ Import for AutoCAD, a plug-in for AutoCAD designed to allow it to easily import OBJ files into your project. Published by SYCODE, OBJ Import for AutoCAD can do more than merely convert your OBJ files. You can use the plug-in to import OBJ files to your AutoCAD project or create a new one from scratch. If you just want to convert the file, start by creating a new project in AutoCAD. Click the "Import" button under the "OBJImport" menu and add your OBJ file. You can add multiple OBJ files and combine them into one if you wish. Click "File" and "Save" to save your project as a DXF. Remember, an existing copy of AutoCAD is required to use this program.
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