'Smooth volume'

[Chamcham (방채미)]

New Rib_Mcneel Forum.3dm (3.4 MB)
Rib V1 Dendro_Mcneel forum.gh (31.4 KB)

I did ‘union’ and then ‘Smoth volume’, but the rib and the slab doesn’t union.
How can I fix it?

[Joseph_Oster]