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4040 fan??? Do you mean a 4020 fan? There is a Dual 4020 parts cooling fan duct STL in the files. If you want a single 4020 fan parts cooling duct there is a remix for that here: https://www.thingiverse.com/thing:3455775. But I tried looking up a 4040 fan and found nothing. Point me to the fan you want to use and I will see what I can do. (it will be added to my long mod request todo list).

CR-10s Pro Hero Me Single 4020 Cooling Duct 2nd Gen
by Stefire