Mike R. answered 07/08/19
Design Engineer with 10+ Years Utilizing Cad Software
Hello!
I would recommend exporting the file to an .stl and then converting the .stl to an .obj. Although, depending on the software you are using, .stl may be sufficient. The command in autocad to export to other formats is just EXPORT. Then under types of file, hit the drop down menu and select lithography (.stl). The EXPORT command can also covert to FBX.
Let me know if that works. If it doesn't it may be an issue in the file itself and not the conversion process.