D-Link DIR-860L Router Fan Adapter

I have a D-Link DIR-860L wireless router. It runs a little hotter than I would like (DD-WRT reports CPU temps of over 75C). In order to reduce the temperature and hopefully prevent future problems down the road, I made this adapter to mount a fan on top. The adapter is designed for a round 90mm PC fan.

D-link makes a few routers that look similar to the 860, but I don't know if they are all the same diameter. The FreeCAD source file is included. Feel free to use and modify as you like.