I wanted to add focus ring to my Logitech C310 webcam, but I didn't like beefy designs I found here, so I have started with original design and I slimmed it out to make it look better, and also to use less material for printing.

Additional hardware required:

2x M3x6 socket head screw

Post-printing:

You may want to cut thread in holes for M3 screws in "back" using M3 tap

Installation:

1. Take off front cover of camera (it is clipped on) 2. Unscrew inner cover, keep 3 screws for assembling Focus Ring 3. Remove glue from camera lens, so lens threas would be free ald will allow rotation. 4. Attach "back" to camera using 3 screws kept in step 2 5. Put "ring" on lens 6. Attach "front" using M3x6 screws

Additional information:

Tested with Logitech C270 and Logitech C310