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Close Holes

Tries to close holes with new faces: the green edges in Analyse, which have only one face. You'll be surprised what it can close.

Group: Repair
Fixes: Green: edges with 1 face
Works on: Your selection, or the whole model if nothing is selected, including groups and components nested inside. In a component, every copy changes.
Version: Full

How to use it

Fix orange and red first (Group, Delete Single Edges).
Run Analyse and look at the Edges with 1 face (green) counter.
Click Close Holes.
If the counter went down but isn't 0, click it again. Stop when it no longer changes.

Before and after

Analyse view of an open hexagonal shape with green open edges; the counter shows 608 edges with 1 face and 1 solid — Before: 608 edges with 1 face (green); 1 solid.

After Close Holes: the shapes are closed and shown in magenta; the counter shows 0 edges with 1 face and 29 solids — After: 0 green edges; 29 solids (magenta).

Limitations and intentional geometry

Close Holes closes every opening it finds. Surfaces that are meant to be open, such as terrain, a sheet or a single pane of glass, will be closed too. Select only the parts that should become solid.
Complicated holes may need several passes, and some need a manual fix: draw the missing edges or faces yourself.
Very small holes may be too small for SketchUp to fill. See enlarging a small model by a factor of 1,000.

Check the result

The green counter shows 0. Look at the new faces: a hole bridged the wrong way can show up as yellow edges, which Delete Inside removes.