Does that mean increase the Scale factor from 0.5 to 0.95 (for example) ?
But the same scale applied to all spheres will result in different thickness because they all have different radii. You can calculate a different scale factor for each sphere so all have the same thickness like this (white group):
coral_2021_Jul27b.gh (28.3 KB)
The faces of each of these closed breps have no thickness at all, they are “surfaces”.