currently there’s a workaround to extrude surface to solid in normal extrusions by converted in the solver CalculiX. After solid mesh in generates, PrePoMaX is capable to export the mesh results in INP format and imported back.
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it’s also capable for multi-layer options with number of element trough thickness. However the nodes are actually separated and need to merge or connected to become continuous.
please follow this threads regarding merge nodes.