“Non-manifold edges” in Bambu Studio.
You sliced, and Bambu Studio told you the model has non-manifold edges — sometimes as error 6106, sometimes as a bare count like 776 non-manifold edges. Here is what it is actually complaining about.
What it means
On a closed solid, every edge is shared by exactly two triangles. Non-manifold means some edges are used by three or more — surfaces meeting in a way no real object can. The slicer cannot work out which side is inside, so it stops.
Why your model has them
| Un-merged bodies | Two solids overlap on screen but were never combined. Far and away the most common cause. |
|---|---|
| Mirrored geometry | A mirrored half joined to the original leaves a doubled seam down the join. |
| Sculpted meshes | Blender, ZBrush and similar let you build surfaces that intersect themselves quite happily. |
| A failed boolean | The CAD operation reported success but left slivers behind at the cut. |
Three ways to fix it
- Bambu Studio’s own repair. Right-click the object and choose the repair option. It is free, it is already open, and for a simple case it works. Try this first.
- Fix the cause in CAD. If the repair keeps failing, the geometry underneath is the problem. Find the two bodies that overlap and merge them properly into one solid.
- Send it to us. If it will not come right, we will repair the mesh from £15, or redraw the part from £45 when the mesh is past saving.
See where they are first
Before you repair anything, it is worth knowing how bad it is. Drop the file into the checker — it counts the non-manifold edges and draws them in red on the model, so you can see whether it is one bad seam or the whole part. It runs in your browser; the file is never uploaded.
An auto-repair that closes a hole in the wrong place will slice without complaint and print wrong. Seeing the fault first tells you whether to trust the repair.