WINSINN 50mm Blower Fan 12V 5015 Hydraulic Bearing 50x15mm Turbine Turbo - High Speed (Pack of 4Pcs)

I tested only one so far, others are spare. Works great. Edit after futher testing : I have compared it to others fan of same size with respect to flow and static pressure. This blower is indeed the quietest but provides the lesser flow and pressure. I recommend it only if you need low noise and that you dont need big airflow performance. For 3D printer, if the airflow is not too much restricted and the fan not too far from the object to cool, it is totally fine. Direct blow without fancy air duct is best. In my application where i need the airflow pushed though a filter, this blower is too weak so i will use others.

These turned out to be a little disappointing. They are reasonably quiet and blow fairly well but do not generate much pressure. I wanted them to blow down a flexible tube so I could blow sawdust away from the tool of a cnc. There is almost no flow at all after attaching the tube. fluid dynamics is out of my field but is suspect it is because the blades are flat and square. Maybe if they were more "spirally" they'd be better at making a decent head pressure. I may be being unrealistic but I wanted something quieter than a "compressor" - like lilo inflators. Maybe I can just mount this on the end of the tube and have it blow directly. Call me demanding but if I can blow silently down a tube I really don't see why China can't supply me with something electrical that does the same for under a fiver, delivered to my door, in under a week.

i got these following NBR's guide on building his 5015 cooler for the ender 3 s1 3d printer. they are powerful and they have a good operating and noise range, at full speed they are loud but no where near as loud and annoying and ear butchering as the horrible stock 4010 fans on the ender 3 s1.

These work well enough but when used as part cooling on a 3d printer, they dont seem to last long. My printers are running pretty much 24/7 and I think the movement of the head causes premature wear on the bearings. They work well and are quiet, probably better suited to a stationary cooling.

An absolute rubbish. Used for 3d printer. 2 out 4 break down after 1 day. Become extremely loud vibrations could be felt on banch not only on printer. Next two went after 48h. Don't bother to spend a penny on it. Despite any intentions to use.

Brought to upgrade cooling on my printer Hotend, products work great and i run them at lower speed while having increase cooling performance

I bought these as i need to add some stronger fans to my 3d printer. The airflow is way too much i actually need (only using then at a speed between 50-70% of its maximum), but rather have the option to increase than not. It significantly improved the overhangs of my prints. And its not noisy as some other fans I've tried.

Used as my part cooling fan for my hemera hotend/extruder. Needed a 24v 50mm blower fan. Fitted perfectly into my printed fan duct and holes lines up with the installation bracket. Usually I would go with a super quiet noctua fan but they are not available in 24v configuration and I didn't want any more wires/voltage control than was already required. The fan is not as loud as I initially tjoigh it would be. I was pleasantly surprised about that. I did have to extend the wires but that's of not fault to the product. The cable length is more than adequate for the normal use of such a fan. 3d printers however need some extra cable management for movement. All in all a great product and i now have 3 spare as I couldn't buy individually.