Hexagon Dual Fan Duct
thingiverse
The Hexagon Hot-End is my favorite. This dual fan duct mounts two 40mm fans held in place by the hot end itself. Thus it will fit to most direct extruders as well as to Hexagons mounted to bowden extruders. Prints without support if your printer is well aligned. Use a M3 screw, >20mm to lock the bracket.
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