Create STL 3D Design File for Ring

I would like a DNA Ring STL file just like the one pictured, but instead of 12 spirals, I would like it with only 10 spirals. Everything else I would like identical. I would like to have 11 separate files in STL format, one for each of the following ring sizes 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, and 10 I am hoping I can find someone to do this work for $50