Simple customizable six bladed fan

thingiverse

Just a simple fan for smaller motors that's easy to adapt in OpenScad or use the customizer for. The default angles are 45°, so printing without support should be possible with most printers. The axe hole might not fit even if you measured correctly because its real size depends on the material used, the printing temperature and the printing speed. So either experiment and adapt the variable "shrink" to your needs or make the hole a bit too small and drill it to the correct size after printing. Please note: Plastic can break and fast rotating blades can cause severe injuries such as eye damage. Don't use such a fan without casing.