Usongshine 3D Printer Cooling Fan 30 x 30 x10mm 3010 DC 12V Cooling Fan with 2Pin Wire, 2 Packs of Mounting Screws (12V Pack of 2)

I got these because reviews said they were quiet. I put four fans to use immediately and one "fell out" after a week, howling and squeaking. SO, after about two weeks, 3/4 of them are still quiet. I will report back after some longer period of time.UPDATE: Three weeks in, two have become "howlers", I have downgraded to only 3 stars. It appears that these are not any better than any other cheap fan. So, I now rate them disappointingly average in value.

Good fans work fine, as far as noise they are average would not bother most anyone.

These fans move such a small amount of air that I really can't think of any real application for them. I can't imagine they'd even improve on natural air convection very much.Note: I ordered the 12V 30mm variant as a drop-in replacement for my Duplicator i3 hot end cooler, just to get me through the design and print process of a better blower.

Wrong size, not sure if it was my mistake or the fact that the listing is missing a few details.

Quiet at first and the next day the bearing would grind like it's about to fall apart. The second fan started doing the same a few days later as well, although not as bad.

These fans don't produce a lot of air flow. I actually replaced fans that were blowing much faster. BUT the reason I replaced the fans - they got super noisy and were super annoying. These ones are quiet, just don't cool down the surface as much. So far nothing broke and I really like the quietness.