Create extruded 3D solids in FME

I'm trying to create extruded 3D AutoCAD solids from a table of data containing coordinates and level information. Using the
3DPointReplacer, Bufferer and Extruder, I am able to create 3D mesh objects, but not true solid objects. Is there a format attribute of DXF/DWG that I can set to force solid creation, or is this just not possible in FME 2010?
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