I had the same question as you. I do have AutoCAD as well and just did a test with all the available formats. It looks like x__t and STEP works the best, then IGES. I import them into CAD, and then save as DWG. I then import the DWG into SketchUp
I had the same question as you. I do have AutoCAD as well and just did a test with all the available formats. It looks like x__t and STEP works the best, then IGES. I import them into CAD, and then save as DWG. I then import the DWG into SketchUp