I liked the design of https://www.printables.com/model/280283-bambu-labs-x1c-exhuast-adapter, but since I only had a 100mm pvc-hose available I did a quick and dirty remix.
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All creds go to the original creator.
*Update 2022-11-27*
The X1C exhaust fan didn't really have enough power, so I bought a 100 mm channel fan and rebuilt the adapter so the external fan could sit in between the adapter and the pvc-hose.
The author remixed this model.