Fix gaps between stitched edges and vertices to make the actual geometry of the
surfaces consistent with the model topology.

From the Geometry ribbon, click the arrow next to the
Cleanup tool set name and select
Geometry Match Topology.
The Geom Match Topology dialog opens.

Using the Entities selector, select geometry to
check.

In the Tolerance field, enter a tolerance to use when
checking the topology of the model for gaps between shared, nonmanifold, or
suppressed edges.
If a gap is found to be bigger than the specified tolerance, then the surface
and edge geometries will be morphed parametrically and in 3D, if necessary,
to make the gap smaller than the tolerance. In addition, nonessential
degenerate edges are removed.

Click Apply.
The original geometric entity IDs are also preserved. The same functionality is used
for the Optimize for CAD option in the Geometry Export Options
dialog.