https://forums.autodesk.com/t5/inventor-forum/converting-surface-to-solid-inventor-2015/m-p/5551520#M382401 <P>I got something like that, but 69 MB. Even with EOP up it's 33 MB.</P><P>Filesize seems to be caused by many spline points at the manifold contour. Inventor should have an option for rebuilding those faces.</P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P><P><IMG border="0" src="https://forums.autodesk.com/t5/image/serverpage/image-id/159695i31818C52243484DF/image-size/original?v=mpbl-1&amp;px=-1" alt="Cylinder 1.jpg" title="Cylinder 1.jpg" /></P><P>&nbsp;</P><P>&nbsp;</P><P>Walter</P> Sat, 21 Mar 2015 14:18:02 GMT WHolzwarth 2015-03-21T14:18:02Z