WINSINN 40mm Fan 24V Dual Ball Bearing DC Brushless Quiet Cooling 4020 40x20mm for Inverter 3D Printer Extruder Hotend Makerbot MK7 MK8 CPU Chip Arduino - 2Pin 0.1A 2.4W 6500+-5% RPM (Pack of 4Pcs)

Tun was sie sollen

Ottima qualita, le ventole sono silenziose.

Good but noisy. But that's pretty normal

I purchased a set of these 7 ish months ago and they're all dead or entirely too loud. Wires easily separate from the board. Two of the fans out of package I had to resolder the wires. one of the fans (not one I had to solder) lasted less than a day before making loud annoying screaming noise. The second one lasted a couple of weeks before having to be replaced and the last two started getting loud a couple of months ago but now at a point where they're unbearably loud and need to be replaced. I had purchased a 24v hydraulic bearing set. I need to find some more now but as most of these are just rebranded fans, I'm going to have to do some research to find some good fans that'll last more than a few months.

Produto silencioso e duradouro. O pack vem 4 que irá durar por muito tempo.