The 3DSOLID in the drawing has some issues. The faces seem to be inverted an the faces at both ends are missing.
I managed to create a new 3DSOLID from it like this:
- _EXPLODE the solid into faces.
- Create regions at the two ends of the solid
- Create a new 3DSOLID from the faces with the _SURFSCULPT command
See attached DWG and video.
Thomas Brammer ● Software Developer ● imos AG ● LinkedIn ● ![](http://download.autodesk.com/us/expert_elite/ADSK_Expert_Elite_Icon_S_Color_Blk.png)
If an answer solves your problem please [ACCEPT SOLUTION]. Otherwise explain why not.