Wanhao Duplicator 4x - Additonal cooling

Adds additional cooling for PLA printing on the Wanhao D4X designed to slot into the triangular gaps in the top corners of the printer.
Allows for easy removal.
Designed to fit the Corsair AF120 Quiet Edition fans http://www.ebuyer.com/579575-corsair-af120-led-blue-quiet-edition-high-airflow-120mm-fan-twin-pack-co-9050016-bled