SketchUp can save the active Section Slice as its own 2D file in the DWG and DXF formats. As with all vector information, section slice export has the advantage of preciseness. Export a section slice using the Export > Section Slice menu item in the File menu.
Section Slice Export
NOTICE: SketchUp 2015 is here! When you look at this Knowledge Center article, be sure to pick "SketchUp 2015" from the red box above to see the 2015 version of that content. If there is no version picker, this content applies to all versions of SketchUp.
This is a Pro only feature.