Rail slot camera mount + ball and socket join.
You will also need the casing for web camera, you can find it here https://www.printables.com/model/215957-standart-laptop-webcam-mount-for-ender-3-with-arti/files
I'm using cheap ‘fish eye’ lens, because webcam is placed too close. You can find the lens on your local market or aliexpress, or just google “smartphone lens”.
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