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With those two you mentioned would be problem with attachment. They have holes for horizontal mount (under the heatsink or carriage), but my hotend cooler is designed for fan and carriage placed vertically. You can still try to glue it on the right place, but I have no personal experience with such setup. Something to cool down printed PLA is still on my list of improvements, but do not expect it being ready and published before Christmas.
Edit: It took more than two months but fan duct is finished - http://www.thingiverse.com/thing:1276315