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3D models that are created in another program and then imported into Autocad will not be 3D solids. As Steven-g mentioned, check the properties of the imported objects. They are most likely meshes, not solids.

Hey guys. @benzson11 don´t use "_A" in (setq selectionset (ssget "_A" '((0 . "3DSOLID,*SURFACE,CIRCLE")))) use "x" (setq selectionset (ssget "x" '((0 . "3DSOLID,*SURFACE,CIRCLE")))) "All" or "al" is used in (command ".erase" "all" "") for example. In the ssget function to select everything "x" is used. I changed the purge command too. I changed your file, test if that's how you wanted it. Sorry my english from google translator. Because I don't speak English. QB-BENZSON - new.LSP

Brilliant. That worked a treat. Many thanks

Limited in some ways but don't forget Bricsys Shape. It's the BricsCAD free software aimed at concept modelling it does 2D and 3D. Creates dwg files it's really easy to use the main limitations are no dims (apparently you can copy a dim from and external file and place and adjust those to get dims that way if you really want). And no Layouts but you can print to PDF to get 'views' out. But anything you create is saved as dwg and should you wish to then upgrade to BricsCAD for dims and Layouts, and more advanced stuff like sections even BIM data, it can all be done with the model you create in Shape, no need to make any changes.