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I'm using a totally stock Ender 3 Pro (Not a clone) with the Creality OEM hot-end. The nozzle is also the one that came with the printer.
So I'm still standing with my comment above that the Gen 2 duct is definitely not compatible with the Gen 3 base on the stock Ender 3 with OEM fans, hot-end and nozzle.
I think the statement that it is should be removed so no more people waste filament and 5+ hours of print time.