Wathai4010 Blower Fan 12v Centrifugal Fan 40mm Computer Case Tiny Micro Turbine 40x40x10 for DIY 3D Printer Cooling 2 Pack

I used this to replace the blower fan on my 3D Printer (Geeetech Mizar S -- the shrouded fan that powers up after the first layer is placed). It works great, and the extra-long cable was nice (I only needed a few inches of it; I cut and spliced it to the original, smaller connector from my faulty stock fan). I did notice it's a bit louder, though, as it is a more efficient blower fan than my stock; in fact, I had to drop the fan speed settings by 25% because it was causing some of my print jobs to warp by the 3rd or 4th layer drop. Not a complaint, as I've been printing for years now and am quite used to adjusting its settings, but keep that in mind if you purchase this for your own 3D printer. Recommended. Will update this if it prematurely fails (as of this post, I've only used it for two days now -- about 5 print jobs so far).

Very quiet and helps keep my stereo equipment cool

Bought these to keep routers and power adapters cool and they work really well and run practically silent while providing good air flow. These run 24/7 in an attic with very little ventilation and airflow. The fans are both USB ends, come with fan grills/guards, and a USB splitter to power both fans from a single plug. The speed can even be powered to lo/medium/high. Really great value for what you're getting.My only drawback was that it was missing a screw bolt (only 7 of 8 were in the box) to complete the grill attachments for the second fan. No big deal and still serviceable. Would purchase again.

I installed these on the bottom of a shelf to circulate air behind a freeze dryer that is surrounded by 3 walls. These fans circulate quite a bit of air and keep the freeze dryer from overheating.

Bought these to replace stock ender part cooling fan. Added a dual cooler setup and needed two, both are installed. Turned printer on to verify spin direction and was immediately amazed at the power. I have yet to run a print nor able to verify longevity but so far I’m impressed. Would buy again provided they last long enough to make it worth it.i also need to note , they are pretty loud. That is no bother to me, yet.

These fans are quiet and put out a solid amount of airflow, however, they will not run when plugged into my ANKER PowerCore 3. They work fine when plugged into my PC but I needed them to run off of a portable battery and they do not. Be aware of this if you are taking them on the go.

These fans are great. I plan on plugging them into a battery brick and putting them into a car window while parked in the sun. I have rain guards on the windows and these are the perfect size to mount in the gap under the rain guards. The included power cord allows both fans to connect to one USB port and has a switch to turn it off and set to 3 speeds. I didn’t realize that feature was on the cord so I’m pleasantly surprised. The fans aren’t very loud either so I’m guessing it won’t be noticed by anyone walking past the vehicle while they’re in use. I will definitely buy these again to keep in my other vehicle.

The first 2 sets all 4 fans were making noise within the first month. Now the replacement fan I exchanged them for are making screeching noises day before 1 month. 8 fans in total now. I have used other Wathai fans in the past, but the build quality must have gone down. They do not last. I can not afford for a fan to stop and have electronics overheat.