Review on 4Pcs WINSINN 50Mm 5015 Blower Fan 12V 3D Printer Dual Ball Bearing Brushless Cooling Turbo Turbine 2PIN by Jarom Bulles

Most printing enthusiasts know, or learn, that a single 4010 fan is insufficient for high-speed printing and steep overhangs. I run a modified Ender 3 Pro with a Petsfang v2 duct for part cooling which requires 5015 fans. The "hydraulic bearing" fans are horrible on anything that moves or rapidly accelerates, as well as any setup where the fan isn't mounted completely vertical or horizontal. They also have a laughably short lifespan. These here are great. Pay the extra cost and get these fans with the dual ball-bearing. They operate well in any orientation (like 45 degrees on a Prusa). You can also lubricate this type of fan if you need to. However. DO NOT expect these fans to be "quiet" (compared to a 4010 fan). These things MOVE air and doing so comes at the cost of a few extra decibels. The fans can be a little whiney when under 90% power but the cooling efficacy is unmatched.