Impeller and Semi-axial impeller fans - 115mm diameter
thingiverse
I'm thoroughly enjoying testing various designs for my bathroom exhaust fan. Although it's overkill, I find it to be a fantastic hobby and these 1mm blades print incredibly well with zero thin-wall infill. The fan is carefully positioned so that its large side faces the interior of the air duct, while its small end points towards the air intake (as this is a ceiling exhaust system, the large end is effectively the "top" within the ceiling). I designed this using Fusion 360, achieving a diameter of 115mm and a 5mm hole for the shaft.
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