To check stitching of surfaces before exporting your model to a wire file and replace surfaces in I-DEAS MasterSeries

1. Stitch the surfaces using Surface Edit > Stitch > Shell Stitch (with Keep Originals on) and carry out a visual check to confirm there are no gaps. If the model that has been stitched is intended to describe a closed volume, check the stitched geometries using Object Edit > Query Edit.
2. Delete the shell and repair the NURBS model.
3. If required, stitch the surfaces again and export the stitched object to a wire file. Also, save the NURBS model for further modeling operations.

   For more information see Edges do not match.