Modified the rear cooling ducts from here and here so that it fits the printer perfectly without hitting anything.
I also orientated the fan mounting position the other way compared to the other two models since the fan I used seemed easier to find online. I used a 24V 50x50x15mm blower fan.
The results turned out great. I can actually see while its printing as opposed to a front cooling duct and have no clearance issues in the rear.
I've attached the SolidWorks (2013) file in case you need to modify it. Please excuse the sloppy modeling techniques. :)
BLOWER_15MM.SLDPRT | 2.1MB | |
BLOWER_15MM.STL | 113.8KB | |
BLOWER_MOUNT.STL | 22.2KB |