Ender-4 40mm Cooling fan
thingiverse
This 40mm cooling fan is specifically designed for the Ender-4 and is mounted behind the X-axis mount sensor. The fan I'm using is a 24-volt model, and you can find similar ones here: http://r.ebay.com/Oct2Bz. The cooling fan duct drops vertically and easily snaps into place. I haven't yet tested which nozzle performs better - the larger one or the smaller one. That's still in the testing phase, so I'll be doing some experimentation over the next few weeks to see which one works more effectively.
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