How to increase the volume of a figure in the 3d plane?

Question

css

Good afternoon, dear connoisseurs. I've run into a problem that I can't solve for hours.
The essence of the problem is that I cannot figure out how to increase the thickness of the lines in 3d flip. Ie, I have an svg image and when it is rotated around the axis, thin lines are formed. How to make thin lines not thin (give them volume)?
I thought to solve this problem by the principle of superimposing one image on another .. i.e. layering, but somehow I didn’t manage to do it very well ..
I would be grateful for absolutely any help! Thank you!