Redesigned the filament Duct Fan to be able to print PLA.
No screws and no other special hardware needed.

The fan is not hitting the enclosure door as original design.

I used a Glue Gun the fan & holder and works very well

You can get yourself those special long hex screw if you are worried about not holding up.

Print it on the Side, tested on long term ,works great.

MakerBot

MakerBot Replicator 2X

No

No

0.3

100

You need to buy an extra 24v fan & cable extension and connect to motherboard FAN connector.

I used Left extruder fan connector to plug to bottom filament fan as I don't use both extruder at the same time for PLA prints (same me the cable extension).
for the above in Makerbot desktop , to activate the Left fan cooling (connected to the filament cooler), yo need to set the left extruder to use Hips at 200 degree or else wont enable the temperature cooling control (I suggest to use other better software).