I needed to add a focus ring to my C270 camera, but couldn't find the perfect model. After printing a bunch, and finding nothing that was both good looking and easy to install, I discovered that the inner camera ring and lens cover from @Pomi sandwich beautifully around the faceplate from @SquishinStix. No changes needed.
My print is in a mix of polycarbonate (black) and ASA (grey), but that is just what I happened to print each of the separate models in.
Hope this helps someone else too!
The author remixed this model.