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HeffaBot PolyStroooder Fan Duct
This is a minimal fan duct for the PolyStroooder Tri Hotend, to be used with a 25mm fan instead of the normal 30mm one.
I use a high effect Sunon fan, that is both effective and quiet.
My effector can be found here: https://www.youmagine.com/designs/heffabot-polystroooder-effector
For the part connecting the fan I used DoomMeister's "Fan Mount/Duct - OpenSCAD Library" found here: http://www.thingiverse.com/thing:18273