🌀 WINSINN Dual Ball Bearings 40mm Blower Fan Brushless Cooling 24V 4020 40mm20mm – Pack of 2Pcs: Unmatched Cooling Performance for Optimal Airflow Efficiency Review

I bought these to replace a Creality 4020 24V fan that had failed at the solder joint (seriously these fans are poor quality). These replacement parts arrived quickly, so I got to work straight away. I cut off the connector, cleaned the case and connected one to the previous wires. Nothing. Polarity switching (these are Chinese fans, polarity markings are a suggestion, not a standard), nothing. Tried a second fan, same thing. So, yes, I had to modify the fans to try them out, which almost…

Bought for a special extruder for 3D printer, they fit perfectly in the frame of the printed part. So far it works great. This is WINSINN Dual Ball Bearing 40mm Brushless Fan 24V 4020 40mm 20mm (2pcs)

Both mines worked. I replaced 4010 with 4020. They are loud. But they do their job. Definitely not a fan you would want on a printer in your bedroom.

2 were boxed, 1 was finished and the other worked fine. I contacted the seller and he said he would send me a replacement fan but it didn't arrive after a month. A quality control of these fans was not carried out.

Loudest fan I've ever bought. i give it back If you work in a factory, this fan is for you. If you like white background noise, buy this one. If you like things a little quieter, this fan shouldn't be your first or second choice.