A simple 90 degree cpap hose adapter specifically designed to work with https://www.printables.com/model/537863-ws7040-cpap-fan-mount-voron .
Install: The blower side is purposely tight to be heat formed for a tight fit. Slowly and evenly heat the end the blower slips into until it has slightly softened and press onto blower. I have found that if you carefully remove it before it cools it will slightly shrink and form a perfect press fit. The hose end is threaded to securely hold the hose.
The author marked this model as their own original creation.