I tried it, setting it like in the uploaded file and well now the color disappeared but that’s not important. I thought this will do it but it didn’t. When I duplicate the curves and go to Object->Convert->Mesh and try to select the tubes in edit mode, only one material selects all of them, and it’s the last set material node in the goe nodes. Now it needs to take the selection. I left anotations to make it clear. https://workupload.com/file/ZTQVYFrbYRP
