A printhead with nozzles for the Anycubic Viper, versions A to D using the original fans.

I got a used Vyper with a broken printhead. The fusion-file from https://www.printables.com/model/105320-wide-deflectors-anycubic-vyper-printhead (merci beaucoup!) helped to construct a lightweight head with a silent main fan (Noctua) and improved cooling airflow.

The center fan nozzle (air-guide) and the LED shade should be printed in TPU or other flexible material.
CenterNozzle.* has been improved, HiFlowCenterNozzle.* has been added  for nozzles with thicker base. 

For Vyper Revision D a cable guide was added, print it in TPU or other flexible material. 
  (If your print light does not work you probably have a broken cable wire).

Cut  M3 threads into the fan holders. 
You need some M2 bolts and nuts for the side fans. 
Use one longer M2-bolt to fix the LED with a small cable tie.  
Two small self-cutting screws (10x2 mm) fix the cover.

On cooling down. the center cooling fan of the Vyper stops at 64 °C. For some more cooling with the side fans you can append the following lines to the printer's end-code:

M109 R66 ;cool down extruder, center fan stops
M104 S0 ; turn off temperature
M106 ; further cool nozzle with the side fans
G04 S300
M107 ; turn off fan