topic Broken simplified Assemblies in Inventor Forum

topic Broken simplified Assemblies in Inventor Forum https://forums.autodesk.com/t5/inventor-forum/broken-simplified-assemblies/m-p/5761376#M365307 Hello, my company moved from catia to Inventor (2016). I am expieriencing a strange problem with on of our customers: We sell sensors, wich are assemblies but due to our company policy I am not allowed to provide step files to our customers with all the internals. The problem with this customer is that the step files we send to them, get allways imported as surface models (= not as volume models).I can't reproduce this, since I get volume models in catia, in inventor and I even downloaded Solid Edge 8 as a trial version with the same result. (They are usind SE 4 which uses an older kernel so this is not comparable...) My workflow for creating the simplified step files:1) create a new single part2) in the 3d model tab -> create -> derive -> select the assembly3) in the derived assembly window -> derive style: single solid, I am exluding all the internal parts in the model tree4) finally I am closing some internal voids by doing some direct edits (extruding faces)5) converting it into a step So my questions: 1) Have you expierienced some thing like that? How did you solve it?2) Are there features which are known for causing this? (I think all the surface operations, like stitching are producing surface models. Are there others?) 3) How do you your simplified models?  Greetings,Roman Fri, 07 Aug 2015 11:23:14 GMT Roman--- 2015-08-07T11:23:14Z