Review on 🌀 WINSINN Dual Ball Bearings 40mm Fan Brushless Cooling 24V 4020 40mm20mm - Pack of 2Pcs for Efficient Cooling Solution by Timothy Castillo

The thing blows as written, but much louder than the original from the 3D printer. I know they claim to use double ball bearings but that's not obvious without disassembly. Standard 40mm fans claiming to have double ball bearings (of the same brand) died after less than a month of use and no ball bearings were found upon opening, only standard bushings. This fan has been running for several months so may have ball bearings but. In general I give 4 stars. The price was good but the noise level lost a star.