Cheers Othar for the comment!
People have a variety in knowledge in 3d printing and my files are designed to be send straight to a 3D Printer and so having varying sizes in rings means that people can download the file that fits them and not have to do any extra work before they print it for themselves.
The Hangers and Lights shades in my collection have varying technical fixtures that change with their size like the screw threads and hanging light cord fittings etc, so they are not just scaled versions of each other!
I see what your saying but for me in 3D Printing its best to have final 3D printable files that the client can download and print without having to do any extra adaptations. I cant know other people level's of understanding regarding the changing of a 3D file for printing or what software they may posses or have understanding of, so its best I offer final files that only require a printer!
No worries Othar not seen as an attack, thought I would let you know my approach to 3D Printable files.
Best of luck to you!