Hi Lara,

OK, Silikone is a rubber-like substance?

A winkle is a type of sea snale, so I will translate it as a bevel, or a beveled ring, or a chamfer,
or chamfered edge surface.

You require that the chamfers be the same width?
And/or the same angle with respect to the outer torus?

The cross sections of the smaller torus-like "ring" will probably be different than each other,
perhaps non-circular, perhaps non elliptical, to match the chamfers.

The slant cuts are at different angle directions with respect to radial lines from the center of the big torus, which caused the different bevel widths.

Make the bevel cones the desired uniform width. Then make the smaller pseudo-torus.

-Brian