add fan to cool down the heat sink . work well for me.
for fan can look for round micro cooling fan 25.5mm x 10mm
my region i am using shopee, it ship from china to malaysia. few ringgit only.
for Electrical connection, you can get extra usb 5v to 12V adapter.
need to do some wiring work.
2510 round fan. 5v , 9v 12v, 24V option
adapter i am using USB5v to 12 V option, you can get those 9V, 24v option. or 24v opton can you use spliter connector like @Alex_cf_siu design below link to link with existing back fan
https://www.printables.com/model/558565-extruder-fan-mount-for-creality-k1
photo form this link , kudos. to Alex
fan option . i using 5v fan and connect to 12V. to increase the fan speed. this may reduce the fan life, but not issue just replace when it fail. below USB 5v to 12V adapter i using. just power this 5v Adapter using 5 volt usb phone charger, i bet there are plenty laying around .
for wiring. you can pull 2 core cable in drag chain.
for long period print, i have design a simple adapter for same 2510 round fan to screw mount on the heat sink.
The author remixed this model.
original is use for BL touch. i modified as a fan bracket