Quieter + Cooler Ender-3 Control Box Lid (Stock+4020 fan compatible)

Update 12/05/2018: Added a flush top mode if you don't want the 4020 fan bump.

Quieter and cooler than the stock lid.

Can be mounted with all stock hardware, or a 4020 fan if you prefer.

Print with supports.

I found that the Ender-3 control box lid inlet hole for the fan was too small for the actual fan blades (35mm hole vs 39mm blades), this resulted in some weird turbulent effect which made the fan create quite a lot of noise when mounted, but barely any noise when free in the air.