I made a new fan cover for the FLSUN V400.
The stock one sits too close to the fan and causes a lot of noise.
This one is set back by 4mm and is a whole lot quieter.
Also i added a cutout to have better access to the thumb screw of the extruder.
In addition i opened up the front cooling slots to allow for more air flow but keeping the original design intend.
This model is also flat and chamfered so it can be printed without supports and has no risk for ugly elephant feet.
UPDATE:
Finally an updated file with big chamfers clearing the arms while moving in the front of the bed.
The author marked this model as their own original creation.