# Blender


## Bambu's "No layers were detected" error 

The error can also happen with geometry that is technically manifold but has **self-intersections, duplicate faces, zero-area faces, or bad normals**.

Go through these checks in this order.

### 1. Recalculate normals

In Edit Mode:

**`A` → `Shift + N`**

Make sure **"Recalculate Outside"** is selected if Blender asks.

Then export and try Bambu again.

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### 2. Merge duplicate vertices

In Edit Mode:

**`A` → `M` → By Distance**

Look at the message Blender gives you.

If it says something like:

> Removed 0 vertices

that's fine.

If it removes hundreds/thousands, you had overlapping vertices.

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### 3. Remove degenerate geometry

With everything selected:

**`F3` → `Degenerate Dissolve`**

This removes faces/edges that have effectively zero area or collapsed geometry.

This is particularly worth trying if you've been moving vertices around manually.

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### 4. Check for overlapping/duplicate faces

This one is **different from non-manifold geometry**.

Your object can be manifold and still have **two faces occupying exactly the same space**.

In Edit Mode:

**`A` → `F3` → "Merge by Distance"**

again, and then inspect the model in **Wireframe** (`Z → 4`).

Also try:

**`Select → Select All by Trait → Interior Faces`**

If Blender selects anything, those are faces completely enclosed inside your solid. Delete them if they're not intentional.

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### 5. Triangulate the model

Since you're preparing this for Bambu, you can do:

**Edit Mode → `A` → `Ctrl + T`**

Then:

**`A` → `Shift + N`**

This gives the exported STL a very explicit triangular surface representation.

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### One particularly useful test

In Blender, select the object and go to:

**Object → 3D Print → Check All**

If you don't have the **3D Print Toolbox**, enable it under:

**Edit → Preferences → Get Extensions → 3D Print Toolbox**

It can check things such as:

- Non-manifold edges
- Intersections
- Degenerate faces
- Bad geometry
- Distorted geometry

For a model that looks perfectly normal but Bambu refuses to slice, **self-intersections are the thing I'd investigate next**.

And there's another very good diagnostic: **temporarily export the model as STL after triangulating it, then import that STL back into Blender**. If the re-imported STL looks different or Blender reports problems, we've found that the topology is the culprit.