Ender3/Ender5 Extruder fan shroud

This shroud reduces the noisy turbulence created by the metal cover of the extruder cooling fan in the Ender3/5 (and other) machines.  Please note that this does not make the fan silent - instead it lessens the harsh frequencies created by the air as it passes the thin metal of the Ender's extruder cover.  The mating surface of this shroud matches the shape and dimensions of the Ender's fan intake cut-outs.   This shroud should be superglued to the cover so that it aligns perfectly with the pattern of the fan cover cut-outs - this is how the noise reduction effect is achieved. 

Print at 0.2mm or less layer height. Infill not needed