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Sorry to bring it down but if you want to cool your nozzle, then print this mod.
If you want to cool your parts, then wait for Gen 3 OEM 4010 duct or print some other version of Hero Me.
The Gen 2 OEM 4010 duct is not compatible with the Gen 3 base as stated by the author.
First of all, the screw holes in the Gen 3 base are for for M3 screws, while the slots in the Gen 2 duct are for M2 screws.
Sure, you can shave away some material and get M3 to fit, but still, the duct will get too high up and you will cool your nozzle.
When I get it as low as possible then the duct is like 2,5-3 mm above the bed while the nozzle is touching the bed.
If i switch to a lower hole on the base, then the duct is below the nozzle.