Airflow Backflow Preventer Stop Valve

cults3d

I designed this to prevent damp external air from back-flowing into my printer enclosure when my exhaust fan is idle by creating a mechanism that opens and closes automatically in response to the fan's operation. The valve springs to life as soon as the fan starts moving, and just as quickly returns to its resting position when the airflow stops completely. What's more, this valve is incredibly sensitive - it opens wide even at my slowest fan speed, and snaps shut firmly against the edge stops the moment the airflow ceases. I integrated this valve seamlessly into my HEPA Air Filter Scrubber Tower, available for download on Cults3D at https://cults3d.com/en/3d-model/tool/hepa-air-filter-scrubber-tower. And thanks to its backward compatibility, this valve can be easily added to the existing Air Filter design from Thingiverse at https://www.thingiverse.com/thing:2394452. The design itself is a masterclass in simplicity, consisting of just two key components: a Collar and a Flapper. The 42mm Collar fits snugly onto the interior of the Grommet provided on Thingiverse at https://www.thingiverse.com/thing:2394452.