ZYYX Fan Duct

I needed a more efficient filament cooling solution when printing PLA in my ZYYX 3D printer and so i decided to switch to a centrifugal fan.
Designing the duct was not an easy task, very limited space all the way down thru the extruder carriage and further down to the hotend/nozzle thus the slightly awkward and not the most efficient design. If the duct comes to close to the build plate use an exacto knife to carefully shorten it at the bottom.
The duct should lock into place securely as sho