@aser28 said: is constrution lines visible in renders? Well, I don't know about that, I'm not a renderer (would like to be, but it seems to be beyond my capabilities )

What happened when you tried it? There isn't a specific plugin to do this particular task.

The file I attached above is to scale and was made in the same way as EarthMover, with the exception that I used shape bender to curve the original component so the whole ring is round instead of faceted.