How to cap/close spilt open polysurface?

Hi, I need some rescue. I made voronoid tubes with thickness. After I sliced them, they become open polysurface. I can’t cap them. What I did was dup border and was trying to patch them but its not the result i want. - newbie
PROBLEM:

WHAT I WAS TRYING TO ACHIEVE:

There’s no file + corporate…

1 Like

Sounds like you could use the solid boolean