Flsun Ninja Duct V2

This is version 2.0 of my old duct https://www.thingiverse.com/thing:2909075.
Now there is air flow very near filament extruded, in this way the duct provide better performace over fine detail.
This thing does not require any nodification.
It's fit 40x40 fun and flsun i3 original setup, single extruder.