3d extrusions not showing in e-drawings reader or Blender

Hello,

I'm trying to import 3d extrusions from Draftsight into Blender  to gain a persceptive view of my 3d models and render them. Any 2d part shows fine in the e-drawings reader & Blender but none of the extruded components show. They are not meshes but simple extrusions.

Any suggestions? Many thanks Ben