🔌 WINSINN 40mm Blower Fan 24V Dual Ball Bearing 4020 40x20mm Turbo Brushless - High Speed (Pack of 4Pcs) - Efficient Cooling Solution for Electronics and 3D Printers Review

I used these for the fans inside the cosplay helmet to keep the lenses from fogging up and keep you cool and they do exactly that. I connected them to 3 AA batteries and they last a long time. They are a bit noisy and I had to make a case to keep my hair from getting tangled in them, but that has to do with what I was using them for and not a design or manufacturing flaw.

A bit noisy, but not bad for centrifugal fans. But move air! I use them on my 3D printers and they are some of the most powerful fans I've tried. I rarely use speeds above 60%, but with two fans running at 100% I can print overhangs with the Pla that I thought were impossible. Even better than two 5015 fans. My CoreXY printer's fans have been running for a few hundred hours and show no signs of wear. Very happy with them.

I bought these to use as part of the fans for my 3D printer. Must be on a brand new product. Tested the rest of the fans and they worked as expected. Disappointed with the quality control as there was no way the wires could break like in the box.

Bought these fans to do a "fridge conversion on wheels". These things are very noisy when 12 volts are applied to them. I contacted the seller because one of the cases was broken and was told to initiate a Revain return for a replacement. I didn't have to worry about returning it as I really only needed one. When I say they're loud I'm not kidding, I hear this thing in the fridge with the door closed. As loud as it sounds, you'd think it would push out a ton of air, but that's only a so-so…

Bought to fit a new blower to my Artillery Sidewinder X1. It's easier than trying to break the glued-on nozzle off a standard blower to reuse it. I tried three of the four Winsun fans and they all vibrated like crazy when running, one clearly had bearing failure after running for about 1 minute. It began to squeak. The standard fan does not vibrate at all during operation. Sorry, but these fans are garbage. Unfortunately, the packaging broke, otherwise I would have sent it back.

Only one of the 4 was balanced enough when running that I was able to comfortably put it on my 3D printer. The other 3 must have had unbalanced blades or off center components as they vibrated too much making them even louder. I don't feel comfortable installing one of these on my printer for fear of reduced print quality and printer wear from vibration. However, I temporarily installed a _least unbalanced_ fan with good airflow 4 cm from the nozzle. When PLA is printed at about 60mm/s, it…