Superelliptic modular cooling fang
Description
Yet another cooling assembly for Ender 3. It probably also works for CR-10 and other Creality printers with the standard hotend. The part cooling "fang" uses superelliptic cross-sections, partly for airflow efficiency but not the least for mathematical beauty. The modular design is inspired by the original design by [ozfunghi](https://www.thingiverse.com/thing:2763931) with most screw locations, etc. in the exact same places, to make it possible to combine with modules from other remixes. The hotend can be cooled with various 40x40 mm fans, including the super-quiet Noctua 40x40x20. To force as much air as possible to pass *through* the hotend cooler, the duct is tight on the fan side of the cooler but open on the back and to the sides. The part cooling fang is smooth to allow for the air to flow with minimal resistance. The fang exists in four versions; one for the original 40x40x10 radial blower, two for the 5015 radial blower, and one for an axial 40x40 fan. If using a 5015 blower, the new reversed version is recommended.
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