It's a remix! I couldn't find a radial fan fang that will take 4020 blower fan, and attach onto 40mm hotend fan, so I made one. The attachment holes needed to be moved a little, and the supporting structure had to be redesigned since it interfered with the hotend mount.
I have mine attached to a E3D V5 clone that came with Flsun i3, but the holes are made so that you can adjust the Z height, so it should work for other machines that use 40mm hotend fan.
There's two versions, one with BLTouch mount on the side, another without. If you want, you could use my other thing, https://www.thingiverse.com/thing:2842776
to attach BLTouch to the front of the fan. Whatever.
Hardware required: M3 bolts and nuts for 4020 fan and 40mm fan, and the mounting screws and nuts that comes with BLTouch.
Once printed, install it, then put a piece of paper under the hotend and set your Z height to 0. Mark where the BLTouch probe is, and where your nozzle is on the paper. Measure X and Y diffrence, and put it in for X and Y probe offset in firmware. Easy.
Photo is pretty crappy, sorry, but if you can make it out, all cables can be routed to the BLTouch side for easy cable management.
mesh is a little broken, just repair it in whatever slicer you use. It will print fine
I printed mine with 1.75mm PLA
0.4mm with 15% infill density. Took about an hour.
You need to have support under BLTouch mount if you print that version
It's a 90 degree overhang, pretty much. But make sure you don't end up putting supports inside the vents. That would be dumb.