The cheapest fans available often have a lot of injection molded plastic that squeezes out of the gaps of the metal mold when the plastic parts are formed. Removing this may help some.

The cheapest fans now come with the small motor shaft embedded into the frame with a tiny ball of metal formed at the end of the shaft. The ball is what prevents the shaft and fan blade portion from coming out of the housing. This type of bearing and retention cause more friction than a design that uses a bushing and a small plastic retainer ring. They type with the retainer ring are usually floating in the magnetic field. The little plastic retainer ring on the shaft end is only present in cases where the fan is dropped causing more force than the magnetic field will hold onto. If a person such as yourself, presses on this type of fan at the fan blade hub, you will feel the magnetic field and see the hub deflect and then return to the center of the field. Spinning it will feel frictionless. With the ball shaft type, there is little deflection and it feels like a bit more friction when comparing two side by side.

With the ball shaft type, most of the noise will be coming from the friction and transmitted through the body of the enclosure. If you isolate the fan with some damping between it and the enclosure it will reduce the noise considerably. Damping the enclosure, and adding rubber feet between any table or surface may also help.

I had the same issue on my E3V3 KE, the 3510 fan had a hard time spinning (free of debris), ordered a new one and replaced it. Had the same issue in the past with other 4010 fans that Creality uses. I think you had a bad fan to start with.

TLDR; Replace it

I have had to replace both fans on that printer more than once.

Also a loud noise means something is in the fan.

Your bigger concern is when heat creep destroys your entire heat block and nozzle from auxiliary fan failure.

Or when part fan doesn’t sufficiently cool the layers so you get a lot of lifting and squishing.

Keep an eye on those.

Fyi. The fans are wired backwards. If you replace with official creality parts you are fine. If you don’t. You will have to cut off the connector on the new fan, flip it. And reconnect the wires.

Also many replacements fans have the wrong size connector too.

My advice. Just buy official creality ones.

Be mindful when replacing the part fan. The duct must be positioned perfectly and firm or you will see print quality declines.

Also. Always unplug your printer before working on any electronic components. If you don’t. You can destroy the circuit boards.

I don’t think those fans are bad, just noisy. And noisy fans are a thing for a lot of less expensive brands. They tend to use sleeve bearings rather than more costly ball bearings and the fan designs can be not optimized for quiet operation.

I would keep using the printer and monitor the sounds of the fans. If it gets louder or odd new noises appear then something needs to be done. I would recommend starting to look for fan mods for this printer. I’m sure there are some out there. Ender printers have a very active user base for modifications and help.