Prusa MMU2 assembly body fan

cults3d

I did some additional testing using an infrared thermometer to compare the temperatures of the 42mm stepper motors with a 40mm fan on both the MMU2 and the MK3. The thermometer showed an error of about 10 degrees F, but here are the results without the fan: The right side motors on the MMU2 stayed in the mid 90s F, while the left drum motor was over 100F. The Z steppers were around 101F, and the extruder motor was the hottest at 120F. I also compared these readings to my MK2S, where the motors were all over 100F, with the extruder being the hottest at around 110F. With the fan running on the MK3 MMU2, it only lowered the temperature of the drum stepper to 94F. The Cooling Fan also adds a vibration to the machine that vibrates the frame down to the legs. In conclusion, with the latest Firmware 1.0.2, the motors are running much cooler than before, and the cooling fan is not really doing much right now, so it will be removed from my machine. However, if you feel you need the fan, then give it a try.