This part was designed to replace the original hotend fan support, allowing to place the fan turbine 5015, for layer cooling. Differently to others fan ducts, this one takes the air from the hotend rather than from outside. The main reason to make it like that is to reduce the noise and dust. I added two holes for the original inductive level sensor, but I don't know if it fits well since I don't use it, I have changed it for a mechanical endstop switch early in my 3D printing experience time.

Fan turbine 5015.

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FLSUN Cube

No

Yes

0.3

20%

ABS is recommended because of the proximity to the hot nozzle. Other high temperature materials can be used like HIPS or PETG