This fan duct enables you to fasten a 40 mm fan on the (modular) HyperCube Evolution mount (see linked remix sources, or https://www.thingiverse.com/thing:2777161).
Note that the STL files need to be printed on the face where you mount the 40 mm fan. It already has embedded support for the 2 fasteners where you mount the fan duct onto the holder for the E3D hot end (after printing just use a 3mm drill to remove these 2 supports). Use a 3 mm tap to create the threads for the fan screws.
Note that the 3DTouch/BLTouch mount can be found here: https://www.thingiverse.com/thing:2827744
Using this touch sensor mount will require the use of the fan duct with the extra hole in the flange so you can adjust the height without removing the fan duct.