Exporting to netfabb

I am new to 3d modeling and cant figure out how to export a file that i can then import into netfabb. any help would be appreciated.

Thanks

Install the STL import/export extension at the Extension Warehouse.

-Gully

Here’s the direct link in addition to @Gully_Foyle suggestion:
http://extensions.sketchup.com/en/content/sketchup-stl