I also can't open your dxf in AutoCadLT.
In my experience Mathematica's DXF export functionality is at best flakey - sometimes it works and sometimes it doesn't. The attached notebook is something I put together to try to figure out what's going on and where the limitations lie. One issue may be that the dxf exporter is designed to export only 3D graphics objects. The documentation for dxf export states "exports a 3D mesh-based geometric region* to a DXF file. The expr can be any region that is ConstantRegionQ or a Graphics** or Graphics3D object*". However, my experience is that some graphics objects, particularly some 2D objects, simply won't export - Circle[] and Polygon[] being two examples where the error message returned suggests that a 3D graphics object is required (see attached notebook).
With regard to your particular problem, it's difficult to offer any suggestions without seeing the notebook that generates the problematic dxf. Would you be able to provide the notebook? Or at least the section that generates the dxf?
All the best,
Ian
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