Identify outer circles and apply different line weights

[inno]

see also this different but very interesting way if you are open to do that with Kangaroo:

KANGAROO2 Circle Packing - Different sized circles

Here’s a version using 2d pressure to do a vacuum form which pulls the circles together [wrapcircs2] wrapcircles2.gh (23.2 KB)

Outer-inner_Re.gh (24.2 KB)