Just like to share my extruder and hotend mod for my F250. Started out doing the 5015 fan mod but some how it turned into this. Always had cooling issues with the stock setup. Just started testing, but so far so good. Prints definitely coming out better.
I tried out the beta 2.0 firmware and ran the gcode they post for the 32 minute benchy. Came out pretty good.
Modeling and assembling by oneself, using the original motherboard is sufficient. By adding NTC series and parallel resistors, the working temperature can exceed the rated working temperature of Snapmaker. The fan is a purchased MACBOOK PRO Computer fan, which is controlled by the original pwm signal.