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Mathematica supports Export of to the .stl format used by many 3D printers....up to a point. Recent posts explain that .stl can only take graphics files made up of triangles. The posts provide workarounds for special cases. But the user has no way...
the support article says that some mathematica functions need to be forced to do numeric evaluation of their arguments by using NumericQ.  I'll try this.  Thanks Bruce Miller