Substitute Primitive

[Garyhlucas]

Bob,
Splain how you made the taller mesh?

[Bob La Londe]

I just took the top surface of the solid model and extruded it.  If it has "islands" don't forget to extrude those too or depending on the tolerance of your machine you may get tool marks across the top of them.  (Which by the way is part of the reason for the elevated surface anyway.  To avoid edge rounding from machine tolerance issues.)