Rear Active Cooling Duct v2 for FlashForge Creator and Makerbot Replicator 1

I made a few modifications on the design, making it a tighter fit on both the printer and the cooling fan. No more need of tape, it sticks very firmly together.
This also means that it's more difficult to install: you'll want to use a softer material like PETG or ABS, that bends a little when putting in place.
I also improved the airflow, there is more air coming through the vent now.
It's intended to be used with a 24V 50x50x15 mm blower fan. Check out the original thing for details on how