This is a desk fan shroud design that attempts to emulate the new prototype desk fan design by noctua seen at Computex 2018. This design makes use of the Venturi effect to pull in air from the surrounding area to increase the air flow in one direction. This also helps make the air coming out of the fan more directed and increase the fan's efficiency.
This model fits 120mm fans and is perfect for use with USB powered computer case fans. The model can be scaled down or up to fit other fan sizes.
Update 2018/07/29: Remodeled the shroud so that it is smoother.
Update 2019/06/13: Added a v2 design that looks similar to the design Noctua showcased at Computex 2019 as per auggie246's suggestion. This design is marked with the Desk_Fanv2 suffix and it starts at the 5th stl file.