HC Maker 7 hot end fan duct.

thingiverse

The HC Maker 7 is quite the under rated printer. For build volume, customisability and cost nothing else fits the mold. I've already fitted speed nuts to the levelling screws and swapped the glass bed for G10 but what has really improved the prints is fitting this high volume cooling duct. I designed and printed this myself - designed on Autodesk Fusion 360 and printed on the Atom resin printer. If you print it on a FDM printer then I would recommend printing the outlet duct with the longest axis being vertical with the duct outlet on the top. That way you won't have to try and scrape out the supports. The intake volute is to keep down the fan noise and reduce eddys and vortecies. The outlet duct splits the flow into 4 separate flows. This keeps the air flow consistent across the outlet instead of being weak at one end and strong at the other. The duct walls are used as swirl redirectors. The outlet is 20% smaller than the fan annular so that the accelerating of the airflow helps to keep it laminar. The fan I used is a YX2502 Sirocco 40mm from Jaycar.