Simplified bracket for Active Cooling Fan Duct - Duplicator 4 / Replicator 1

For FlashForge og CTC see note at the bottom:

In my struggle to find m3x60 bolts for attaching the Active Cooling Fan Duct - http://www.thingiverse.com/thing:295317 - I found the bracket but couldn't get it to stick properly.

Based on this bracket I've done quite a heavy redesign where it now attaches at the two small holes in the gantry, into the linear bearings. This also allowed me to make it much smaller and simpler. Now all you need are 2x m3 14/16mm bolts and 2x m3 nuts

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