This is a remix of http://www.thingiverse.com/thing:1803120
I liked this cover but the smallest fan I got out of my box was a 70mm one, some kind of abra cadabra and here we go... Use it if you like it and if your situation is simmilar to mine.
printer: Anet A8 (customized)
infill: 30% (fast honeycomb)
wall layers: 4
top and bottom layers: 3
print time: ~45min
use 4 standard fan screws known of mounting the fans to computer cases