try this extension that works on sketchup make too:
http://extensions.sketchup.com/it/content/skema-2d-projection
mybe does wat you are looking for 
ℹ️ Licensed Extensions | FredoBatch, ElevationProfile, FredoSketch, LayOps, MatSim and Pic2Shape will require license from Sept 1st More Info
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RE: 2D DXF export without a pro version?