Flip Reversed Faces

Flips all reversed faces in solid groups and components, so every face points outwards. Having a solid model isn't always enough for 3D printing: some slicers also need the faces the right way round.

Group

Repair

Fixes

Cyan: edges of reversed faces

Works on

Solid groups and components only, in your selection or the whole model, including nested ones. Groups that aren't solid are skipped, so make them solid first. In a component, every copy changes.

Version

Full

How to use it

1. Make the parts solid first (orange, red, green and yellow at 0 in Analyse).
2. Click Flip Reversed Faces.
3. Check the Edges of Reversed Faces (cyan) counter. It can take two or more clicks to turn every face.

Before and after

Watch on YouTube: Fix all reversed faces at once in SketchUp

Limitations and intentional geometry

• Only solids are changed. Open surfaces, where "inside" and "outside" have no meaning, are left as they are.
• If a few clicks don't fix it, something else is wrong with the geometry. Open the solid, select everything (Ctrl+A, or Cmd+A on a Mac), and use Intersect Faces › With Selection from SketchUp's right-click menu. Then check and repair the model again. More tips for difficult models.

Check the result

The cyan counter shows 0. You can also see it in SketchUp: choose View › Face Style › Monochrome. Front faces are white; faces that still point inwards show SketchUp's grey-blue back colour.