running 3x 25x25x10 gostime 24v fans on my smarteffector with e3d v6. during last weeks tried several things to calm it down. long story short:
25x25x8 ebm pabst 252 n/h (quiet expensive - 22EUR, absolutely quiet, 12v with buck-converter) don't deliver enough pressure to cool heatbreak enough (v6 fins mean a lot of static counter pressure - might be different with mosquito)for better comparison:
2 gostimes at 24v for filament-cooling press 2-3mm deep holes into water surface (glass below hotend) 2 gostimes at 12v are much quieter and less turbulent, but only scratch the water surface 25x25 pabsts just scratch surface 40x40x10/20 noctua just scratch surfacemy solution right now: got a cheap buck converter via amazon bringing my voltage down from 24 to 20v. decreases airflow to a just acceptable level while decreasing noise and vibrations quite a bit.
airflow is one thing. getting that lot of air through a tightening channel or along obstacles in the way requires air-pressure (the anti-pressure to overcome is a reason for vibrations and noise). axial-fans are not good in that regard. pressure increases with revs. the ebm pabsts turn with 9(N - absolutely quiet) to 12(H - less quiet) thousand rpms. the gostimes in comparison can do up to 24.000 rpm (quiet noisy - but lot of flow in comparison).
http://gdstime.com/product/?99_471.html
the gostimes - even on full speed - can run comparably quiet. high pitch like a turbine. but as soon as they blow against an obstacle that blocks their way, the sound changes from a steady, quiet, high-turning turbine to a vibrating rattler.
might at least to some new ideas.
