I really like janw's mount, to attach a Logitech C270 webcam. Unfortunately, my Onn Webcam wouldn't work with the C270-specific mount. Fortunately, it has a standard ¼"-20 socket to mount to a tripod, in its base. I replaced the C270-specific mount with a tripod base, using PapaPlintus' excellent Camera Mount Screw to attach the webcam to the mount. 

I printed the screw at 0.1mm resolution, with 3 outer walls, 4 top and bottom layers, and 20% Hexagon infill, which gave a nice hexagonal infill right up the middle of the screw. I printed the mount at 0.2mm resolution, with 3 outer walls, 4 top and bottom layers and 20% Cubic infill.

As with janw's original, an M3 screw is used to hold the clamp onto the printer. Depending on how dialed in your first layer is, you might need to ream out the tripod screw hole or the mounting clamps. I used an M3x12 screw, which allowed me to thread it in partially, attach the mount, then tighten the screw down to secure the mount in place.

My camera in the pic is an Onn Webcam With Ring Light, model # 100027831. I picked it over the Logitech, as it has a ring light, autofocus, and higher resolution (1440p vs. 720p on the C270). It worked right out of the box with my Sonic Pad.

https://www.walmart.com/ip/onn-Webcam-with-Ring-Light-w-3-LED-Levels-Autofocus-Up-to-1440p-Resolution-Built-in-Microphone/505038984?athbdg=L1600&from=/search

Update: Compatible with a baseline Ender 3/Pro, or one with a BL Touch mounted with the “stock” bracker. If you have a CR Touch, check out @TheCatMan2000's remix, which adds the needed clearance:

https://www.printables.com/model/644019-webcam-tripod-mount-for-ender-3-pro-w-crtouch