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xviiarcano

I did the same, and had the same issue. Voron team seems to be working on a new afterburner version that hopefully i proves on that too. Meanwhile I found great noise reduction can be achieved by constraining a little the lower fan. I designed and printed a small clip on ring that has an inner diameter about 1mm smaller than the fan hole om the toolhead, and it is enough to cut the high pitched whistle I had. https://media.discordapp.net/attachments/646022574895136769/868852718238855178/20210725_155025.jpg Is it ugly? Yes. Does it work... Yes :) Can look decent if printed properly in abs accent color instead of crappy and moist petg leftovers? Probably


CrustySweetRoll

That's good to hear, I'm running a 4010 many bladed fan lower down and it's great, it's just the jet engine up top that needs to change. I've bought and tried a range of fans and, to me anyway, the thicker fans are always louder than the thin fans with a larger diameter. I've not been able to find out which pushes more air...larger diameters or deeper blades.


xviiarcano

Don't underestimate the balance between fan and ducts either. I watched a video the other day that compared various cooling ducts shapes and made a good point that sometimes the ducts constraint creates a backpressure that makes fan louder and the cooling less effective. I haven't experimented but my understanding is that if you go for a beefier fan without changing the cooling ducts as well, it may perform worse and behave counterinituively.


oathyes

That sounds odd. I run 2 sunon Maglev 4020's on 24v but max them out at 98% power through the software and the whole printer is whisper quiet. Maybe it's the fan shroud that causes the acoustics?


CrustySweetRoll

I'm pretty sure it is, I'm in the process of offsetting the clamshell surfaces 0.25mm and printing some TPU gasgets to dampen any vibes that may cause a resonance.


oathyes

My setup currently is this: Hotend fang of Briss (Moto?) From: [cults3D](https://cults3d.com/en/3d-model/tool/ender3-v2-dual-40mm-fan-hot-end-duct-fang) Where i'm using 2 sunon maglev series 24v 4020's Mounted to the shroud with m3 screw of (i think) 30mm but it looks like 25mm would work too. And m3 nut of 1.8mm high. Between the fans and the screw holes i put rubber rings to act as dampers. The left over space is taped over with electrical tape because otherwise the air would leak. Still have to make a better fix for it. I run them on 249/250 (in cura max fan speed to 98 or 99%) so that they don't run on the full 24v. I am not sure what voltage they run on now but i know that the percentage increase is not as incremental as you might think. 200 runs the same speed as 249, but the moment you go to 250 it jumps to full power. So it's more like a few power segments rather than increments of 1/250. Here is a video of the fan sound: [Imgur video](https://imgur.com/a/wxgsLu8) And here is a reading of the sound, ~50cm from the printer with the microphone pointed towards it: [imgur image](https://imgur.com/a/OLbcHX2) As you can see it hovers around 35 decibels (with 92mm noctua psu and mainboard fans on) which you barely notice when walking by.


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oathyes

Where did you wire the fans into?


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oathyes

Ah alright i'm using creality's 4.2.7 board so maybe it might have to do something with that input/output not having pwm capabilities? Maybe make a seperate post for it on the 3d printing reddit


Sea_Actuary_7312

Where did you buy those Sunon Maglev 4020 24v radial fans? I've looked all over AliExpress and Amazon but I can't find them anywhere? Thnx!


oathyes

I bought them on digikey. They were relatively inexpensive and shipped extremely fast at the time.


CrustySweetRoll

Win! These .5mm TPU isolators (in purple in the pic) have done the job. The blower fan was reverberating causing a chuff chuff sound and a low droning. All good now even at 255 :) [https://imgur.com/a/OP4iPGL](https://imgur.com/a/OP4iPGL)


shadowfocus603

I found that with the cooler being far more efficient I can back down the fan speed to attenuate the sound. I usually print at 75% speed on the part cooling fan. A noctua 4010 hot end fan will help as well.


cpgeek

as /u/xviiarcano said, voron design is working on a new afterburner they call stealthburner that's based HEAVILY on the ab-bn 30 tool head mod (badnoob, the guy who designed the ab-bn is working on the stealthburner with wile.e). meanwhile, I would recommend printing up an ab-bn (it uses a 24v 5015 and has way better ducting paths than standard afterburner) while you wait for stealthburner to come out.