This 40mm fan shroud and air intake deflector fits exactly on a 40mm fan. Other models I tried all overlapped the fan and couldn't fit in my modified 25mm to 40mm shroud.
Print with 0.12mm layer height, 0.46mm line width, no support, hex face down.
Other mods in the photo:
Ender 3 V3 SE 25mm to 40mm fan shroud modified to enclose the fan.
The author marked this model as their own original creation.