Another Ender fan Duct

thingiverse

A simple fan duct for the Ender 2 using a 5015 radial blower fan is all you need. You will also require a 25+mm M3 screw and nut to secure the blower, although a zip-tie can suffice in an emergency. This fan duct mounts directly onto Superpotatofudge's hot end cooling duct, so be sure to print that first. The blower can then be connected to the K-fan output on the Ender 2 circuit board. Once installed and wired, mine worked seamlessly without any firmware adjustments necessary.