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Hope you can solve the issue.

This is just quick-fix solution if you have broken fan blades:

  • Turn off the power to 3D printer
  • Remove the broken fan but leave the heatsink in place.
  • Turn on the 3D printer
  • Grab hold of the strongest hair dryer you have
  • Start a 3D print of our fan blade replacement (use a slow print speed if necessary)
  • Hold the hair dryer and aim it at, and close to the heatsink while the model 3D prints. Make sure to blow with cold air and use the strongest airflow.

When the print is ready you have new fan blades and can mount it on to the fan. While you are at it, make sure to un-peal the sticker a bit and drop some oil into the fan hub to lubricate it.