3dface dxf files

hi all
i made a surface file on sketchup using the sandbox
now i’m trying to get that surface into my Leica total station
and be able to use it for 3d grading
i would prefer to use dxf files but in dxf it needs to be a 3dface file
and sketchup creates polymesh files in dxf
how do i create a 3dface file in dxf with sketchup?

I think your only option is to use this older plugin:


Select the “triangle mesh” option from the Tools menu/Export to DXF of STL. It exports SketchUp faces as triangles as acad 3DFACE entities.

installed the plugin
had to manually change the file extension from file to dxf
other then that works great
thanks A MILLION