I no longer use this fan setup it was rather clunky. Take a look a this one, its much better:
https://www.thingiverse.com/thing:1519726

40mm_setup_E3D_Volcano.stl

Is a remix of the original version for E3D Volcano for use with the following::

E3D V6 Cooling (thing:4352725) from the original version by Jordie_796

BMG Bondtech dual drive extruder

Original or Pancake Nema 17 stepper motor

Print on its back with support from the build plate only.

Other STL files are included to go with this are "TronXY X5S direct extruder" (thing:3878425).

2020-11-13: Updated for the Volcano, Shortened it a bit so it does not hit the print.

0.2

20%