This is a simple defrost diverter to help clear the windshield of your 2007 to 2010 Jeep JK Wrangler. The 20" defrost grille is simply too short. This will send warm defroster air to the edges of the windshield and look pretty cool doing it.
I added the .stl file for download.
Print standing on end. The overhang is manageable without support and the upper clip tabs are self supporting.