I had originally planned to add a fan to the front of my cab, underneath my CP....well I put the 2" Hole in, but never added the fan.....tahnkfully its tucked RIGHT underneath my rather large CP so you dont see it unless you're 4' tall, or you're bending down to look for it.
Currently I have a nice little 4 port USB hub "wedged" in the round hole, it just fit perfectly.
Eventually I'll fill in the area around the hub with foam rubber or something so it looks better, but
yeah....its great for hooking up a USB trackball or a gamepad or whatever
