Fan Duct for Lulzbot Dual Extruder v3

I had a problem with heat creep using PLA with the Dual Extruder v3. The original fan/heatsink combo is horrid. It uses a low CFM fan and pushes air into, rather than across the heatsink which creates turbulence and poor cooling.

I printed this out of PLA and it has been working great. Please note that it does sit rather close to the heat break on the extruder, and I have had some melting occur, but nothing serious or that has affected the performance of either the duct or extruder.

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