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I really like this design! It is compact and contains all the stuff you need such as both fans and the level sensor.
The only thing I am a bit worried about is if the nozzle gets too much air from the fan supposed to cool the model. Have you seen any such problems?
But I like the duct too, many of the remakes for fan ducts are so complicated that hardly no air is coming out of those tiny holes.
The fan duct can be redesigned while keeping the rest intact, thats another good design.

Maybe I will do a remake with some LED spots on the nozzle...

Top notch!