JBL Flip 3 shelf holder

I remix the "JBL Flip 3 Speaker Holder by JORDANSZ" (http://www.thingiverse.com/thing:1403280) to a shelf holder.
By idea of my wife Els ;)

I have put the SketchUp file with it so you can modify it to you're own shelf thickness
Now it's for a 15 mm (0.6 inch) shelf.