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This is a derivative of my own prior extruder barrel cooling duct. ( http://www.thingiverse.com/thing:8461 )

It is optimized for a 40mm fan, which won't fit inside the 35mm gap between the two large sides of a standard MK5-6 extruder. I find that PLA prints much better with active cooling directly on the barrel itself.

The section STL is for a replacement side to the extruder. It is functionally identical to the original small acrylic piece that fits there - except that it has a big rectangular hole to allow additional ventilation.

I've of course included the OpenSCAD design files, but I didn't try to make the fan mount terribly parametric. There are some variables you could set, like thickness to all parts, but it's not fully parametric. If you have a different fan from mine (40x40x26mm) then you're going to want to redesign the fan mount anyhow.

The reason for the DXF of the front acrylic panel was so that I could essentially create a virtual extruder holder for making sure everything aligned. If you uncomment the section at the top, you can see it too. ;)

Print instructions

Instructions

Loosen bolts and remove front acrylic panel from the extruder holder.
Loosen bolts and remove the small left and right acrylic panels from the extruder holder.
Replace right side with large fan mount and cooling duct.
Replace left side with small hole-y side holder.
Replace front acrylic panel to the extruder holder.
Re-tighten all screws
Connect new fan, possibly with use of these sweet fan connectors http://www.thingiverse.com/thing:8827
Print with PLA easier!

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