Note:  In some cases, Ansys DesignModeler may not be able to stitch together line body edges that are created from existing model edges that are defined by Non-Uniform Rational B-Splines (NURBS) curves or imported geometry. The reason for the problem is that some Non-Uniform Rational B-Splines (NURBS) and/or imported geometry is defined with looser tolerances. When line body edges are extracted from these original model edges, they are not within DesignModeler’s default tolerance and can sometimes fail to merge together during Boolean Operations.