Here are some handy tips for preparing SketchUp files for 3D printing. Pay special attention to to tip #4 if your model needs high dimensional accuracy and tolerances are tight for assembly - http://www.mastersketchup.com/8-tips-for-3d-printing-with-sketchup/

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Happy 3D Printing!

-Prasad @ DigiPhy3D’s Hub

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Thanks for the info!