So I liked the idea ReSc put up and decided to well make it myself.

The right side might be thin on the channel towards the hole. I will update this as they print out along with pictures.
It holds a very light fan so I don't thing it should be a problem.

1st Update: The right fan finished printing as seen in the pictures and it felt a little flimsy but once bolted to the fn using M4 it was really rigid. Also the little clip on the side does not seem to need a screw since it holds everything in place really well. Only problem is that Its just barely brushing with the print surface which can be fized by a little sandpaper, and eventually an updated file.

2nd Update: Recessed the holder (L&R)about 2.5mm in more which should give the fan the necessary clearance when the build platform moves up and down. Will print it again.

3rd Update: I uploaded the DWG files if you wish to modify the walls and get them thicker. I noticed once the fan is bolted on everything becomes very rigid. The hole size means you can just screw the M4 screw in without nuts.

4th & Final Update: To wire the fans just splice the blu&purple cable. I did it so I can turn on and off only the stepper motors. Also I added an on/off switch seen in the picture. I didn't include the file for it since there are so many sizes out there. Used some left over screws from the Ultimaker and voila, looks stock. If the fan holder are a bit loose add some tape on the inside of the "clamp" and thats it.

Enjoy.

I measured my fans before and after the fans. They used to run at about 50C now they run at a cool 30C. BIG difference.
Also I noticed that the fan cooler fins stay put without the paper clips on as long as they don't get bumped around.