UMLIFE 4PCS 50mm 5015 Blower 24V Dual Ball Bearing 1000mm/39in Cable for 3D Printer Cooling Fan and Turbine Turbo Brushless Blower

I needed some fans quick so I choose to order on Amazon rather than Aliexpress. These fans were notably quieter than some Aliexpress fans of similar specs I ordered years ago, interestingly enough I found some same spec fans like these for half the price on Aliexpress recently so I am going to try those out.

Fine, quiet enough high throughput fan for little money. In case you buy a 12 v instead of a 24v as I did for my ender 3 pro, you can stick a 130 ohm resistor in series with the fan to make them work, you will immediately smoke the motor otherwise. Also on the ender 3 the mounting holes don't line up, but the surface is easily gluable so no problem there.

These blower-style fans work well. I'm not using them for a 3D printer. For my cooling application I would say they blow sufficient air, but not a lot of air. I'd like to share that I believe they are DC brush motor fans (not brushless) and they are easy to speed control by the voltage you apply. They should also work well with PWM speed control. They draw only half the power stated which is a nice thing. They are very quiet, but do have a small amount of vibration if that matters to you.

Replacement of blower in humidifier , perfect ! Saves me $60

Bought these for an Ender 3 part cooling fan replacement. First of all, the wires are only about 12" long, which is way too short to be a direct replacement. To be fair it does show the wire length in the product pictures, which I saw only after I started this review. However it does say "for 3D Printer" in the description, so one could hope it would fit properly. The other issue is that the wiring is backwards. Since I had to splice in extra wire anyway due to the short length, I took the standard wiring scheme of red + and black - and wired it appropriately, however the fan did not work. After some troubleshooting, it turns out the red wire is soldered to the - terminal on the fan and the black to the +. After fixing it, it does spin and is pretty quiet. So....if this fan is the only one available, save the wiring from the old fan and plan on splicing it backwards.

Simple, solid color, quiet operation, powerful airflow. Helped me so much with an overheating moto monster control board. Just placing this on the top of the chip was enough to prevent thermal protection from kicking on.

As others have noted several different brands of these fans, it was wire backwards. That was easy enough to fix but not the airflow. The 5v fans I bought on accident move more air than these. I didn't test, but they are so weak they might be 24v fans labelled incorrectly. They are quiet only because they barely move air.

The blower is well suited for cooling the print from a 3D printer. After printing the mounting bracket and duct work the combination works well for cooling the extruded part and a little too well on the build plate. Some insulation was needed on the build plate to reduce heat loss from the underside and compensate for the additional heat loss from the forced air from above. The blower works well and is extremely efficient.

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