I was having difficulties printing at high temperatures (over 245C). Jams happened daily due to heat creep , so I decided I give the coldend more cooling.
According to specs 3010 and 4010 fans pretty much do the same airflow and static pressure they just use dirrefent RPM to achieve it.
I was looking for more and some 5015 radial fans offer almost 5 times as much static pressure and around +50% CFM so I went for it and never turned back:)
I used PETg which can flex a bit but ABS is also great.
Wouldn't use PLA due to radiating heat (but most likely you can get away with it just fine -
please comment if you had luck with it).
4 top layers
3 bottom layers
You just clip in the 5015 fan (it should be a tight fit) then screw the adapter to the E3D fan holder.