Circular fan duct
thingiverse
As my hotend is not centered in the carriage (I'm using Greg's accessible extruder: http://www.thingiverse.com/thing:8252), I have adjusted this fan duct design to short it in 4mm (use on the left side of the carriage). I have also added a clearance on the left side to allow space for the LM8UU bearing on both sides. Instructions Print and use.
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