These move a ton of air compared to some stock 4010 models, and they do it at a similar noise level. The quality of sound is air movement over a whine. The fact that the airflow is blown into a restriction will always cause additional noise, and I was pleasantly surprised with the noise level in general. I had two of these in one of the quite large ducts on thingiverse, and it was just overkill. I get the same performance in overhangs and bridging with one as with two, at least to the point that I notice a difference without a very detailed examination. Using these with the printermods MDD system, and have thrown a couple on other printers as well.It's a good deal for 5, and I'd buy again no question.
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