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.

In response I created a new lid for the control box, with a clear 40mm hole (makes sense right?) raised slightly to allow comfortable 4020 fan fitting if required while still allowing for the stock fan if you just want a reduction in noise.

The vents allow hot air to escape freely while reducing print time and plastic used.

On my print I added optional nuts for extra security as I was using longer bolts although the holes are snug enough to fit with just the stock bolts and no nuts.