Delete Inside

Tries to delete internal and extra faces: the yellow edges in Analyse, where three or more faces meet at one edge.

Group: Repair
Fixes: Yellow: edges with 3 or more faces
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, red and green first (Group, Delete Single Edges, Close Holes).
Run Analyse and look at the Edges with 3 or more faces (yellow) counter.
Click Delete Inside.
If the counter went down but isn't 0, click it again. Stop when it no longer changes.

Before and after

Analyse view of a table leg with yellow edges where internal faces meet; the counter shows 128 edges with 3 or more faces — **Before:** 128 edges with 3 or more faces (yellow) in the table legs.

The same leg after Delete Inside: no yellow edges and the counter shows 0 — **After:** the internal faces are gone; the counter shows 0.

Limitations and intentional geometry

If the inner face is a wall between two parts you want to keep, for example two cubes that share a face, use Divide instead. It makes two solids and keeps the wall in both.
Some shapes need several passes, and some need a manual fix: delete the leftover faces yourself where the yellow edges remain.
If faces pass through each other without a shared edge, SuSolid can't see the inside part. See the Intersect Faces tip.

Check the result

The yellow counter shows 0 and the part turns magenta (solid). If it still isn't solid, run Analyse again and look for new green edges: removing a face can open a hole, which Close Holes fixes.