https://forums.autodesk.com/t5/fusion-design-validate-document/sketch-fillet-error/m-p/5772356#M288685 <P>Hi, there's a thread where some great reasons are given to do fillets later with the 3D modeling tools, i.e. as features in the timeline instead of in the sketches, as discussed here:</P><P>&nbsp;</P><P><A href="https://forums.autodesk.com/t5/design-and-documentation/correct-way-to-fillet/m-p/5748377#M29236" target="_blank">http://forums.autodesk.com/t5/design-and-documentation/correct-way-to-fillet/m-p/5748377#M29236</A></P><P>&nbsp;</P><P>In your sketch, you need to instruct the program that the lines are desired to not move sideways, by sufficient constraints and/or dimensioning.&nbsp; The absolute fastest way to do this is using the Fix/Unfix constraint, either on the line or the line endpoints, turning them green.&nbsp; If needed, once you change the fillet radius, you can remove the green Fixed constraints by the same process used to apply it.&nbsp;</P><P>&nbsp;</P><P>Hope that helps!</P><P>&nbsp;</P><P>Jesse</P> Fri, 14 Aug 2015 22:09:56 GMT Anonymous 2015-08-14T22:09:56Z