https://forums.autodesk.com/t5/autocad-forum/offset-faces-of-solid-doesn-t-work/m-p/7530927#M203556 <P>In the solid attached i tried to offset the external and upper, small, round face. this is what i got:</P> <P>Modeling Operation Error:<BR /> Gap cannot be filled.</P> Thu, 09 Nov 2017 15:17:55 GMT Karol-Or 2017-11-09T15:17:55Z https://forums.autodesk.com/t5/autocad-forum/offset-faces-of-solid-doesn-t-work/m-p/7530927#M203556 <P>In the solid attached i tried to offset the external and upper, small, round face. this is what i got:</P> <P>Modeling Operation Error:<BR /> Gap cannot be filled.</P> Thu, 09 Nov 2017 15:17:55 GMT https://forums.autodesk.com/t5/autocad-forum/offset-faces-of-solid-doesn-t-work/m-p/7530927#M203556 Karol-Or 2017-11-09T15:17:55Z https://forums.autodesk.com/t5/autocad-forum/offset-faces-of-solid-doesn-t-work/m-p/7532224#M203557 <P>Hi&nbsp;<a href="https://forums.autodesk.com/t5/user/viewprofilepage/user-id/936694">@Karol-Or</a>,</P> <P>&nbsp;</P> <P>I too received some errors in trying to offset the faces. I rebuilt the outline, flattened it, and then used boundary to get a clean outline. Even this did not want to work so I tried performing the process on just a small piece of your model. Perhaps this will work for you in addition to using UNION.</P> <P>&nbsp;</P> <P>&nbsp;</P> <P><SPAN style="color: #808000;">Please select the <STRONG>Accept as Solution</STRONG> button if my post solves your issue or answers your question.</SPAN></P> <DIV class="iframe-container"><IFRAME src="https://screencast.autodesk.com/Embed/Timeline/22a12e93-89ea-45cf-bc77-6ec5e7d0bb1a" width="640" height="650" frameborder="0" scrolling="no" allowfullscreen="allowfullscreen" webkitallowfullscreen="webkitallowfullscreen" style="display: inline;"></IFRAME></DIV> Thu, 09 Nov 2017 21:42:05 GMT https://forums.autodesk.com/t5/autocad-forum/offset-faces-of-solid-doesn-t-work/m-p/7532224#M203557 john.vellek 2017-11-09T21:42:05Z