Union Mesh not working it is orange

[diff-arch]

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Voronoi 3d FOR A CYLINDER

thank you so much for the help it is working but I have a new problem that I convert the 3d to mesh and give it mesh thicken bcause I want to make 3d printing to it need to have thickness, after that I am trying mesh union but not working. any help and thank you again here is the [1] [2] [3] tajrubeh3.gh (11.0 KB)