Turbo-fan to CPAP hose
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Converts various radial turbo fan sizes (e.g. 7515, 7530) to a tube. Partially parametric FreeCAD model.
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As I wanted to cool my heatbreak fins (E3D) with room temperature air (instead of the hot air from the print chamber), some tubing was needed to get that air there. CPAP tubes are very flexible, tough and smooth on the inside, so they are quite suitable for this job (of course after they can no longer be used for their primary task of helping people breath better at night…).
Normal axial fans cannot deliver enough air pressure for these relatively narrow and long tubes, so the actual air displacement drops to almost zero. Radial (turbo) fans create a bit more static pressure, especially if they have longer fins (measured from smallest to largest diameter of the fan rotor), so they get a lot more air through.
These models can be printed without any supports and can be assembled with M3 bolts and nuts.
The square-to-tube converter is mostly parametric (so you can create other dimensions by just changing the VarSet values).
The mounting plates are not parametric, since the mounting holes and air hole shape of these fans are apparently not standardized. The position of the mounting holes and center holes varies a lot between fan types. So by keeping the model simple (a single sketch), you can manually adjust it for various other fan geometries.