Use the Fuse tool to connect discrete topology surfaces/solids/parts. The Fuse tool can be utilized to connect close proximity inputs by defining a threshold.
Use the Stitch Surfaces tool to stitch or unstitch adjacent
and intersecting surfaces.
From the Geometry ribbon, Stitch
tool group, click the Stitch Surfaces tool.
Optional: On the guide bar, click to define stitch options.
Stitch or unstitch surfaces in the following ways:
Select surfaces to stitch in the modeling window
then click Stitch on the guide bar.
Repair geometry by replacing edges and points.
Click-and-drag an edge to another edge, or click-and-drag a point to
another point.
Select the point(s) to move, then click one of the selected points
that you wish to retain and combine with the other selected
points.
Left-click on a surface edge to advance its topology state from free to
shared. Conversely, hold Shift while left-clicking
to regress its topology state from shared to free.
Tip:
Use window selection to select multiple surfaces, and simultaneously stitch
adjacent surfaces and intersecting surfaces. Adjust individual edges if
needed.
Use the legend in the upper-left corner of the modeling window to assist you
in finding edges. Edges are color coded by type. Show and hide an edge type
by toggling its corresponding checkbox on and off, or quickly isolate an
edge type by clicking Only.
Stitch Surfaces Using the Context Menu
Quickly stitch without opening the Stitch Surfaces tool.
Navigate to the Geometry ribbon.
While in idle mode, select the surfaces to stitch.
Right-click in the modeling window and select Edit > <stitching option> from the context menu.
Stitch Surfaces - This has the same effect as
using the Stitch Surfaces tool with the
Stitch edges only method.
Intersect Surfaces - This has the same effect as
using the Stitch Surfaces tool with the
Stitch and intersect method.
For Stitch Surfaces, enter a cleanup tolerance value in the dialog then click
OK.
Any adjacent surfaces with a distance less than the specified value are
stitched.