> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How to export shelled part as a single CAD file

## Objective:

How to export the shelled part as a single CAD file

## Procedure:

1. First, create a hollow part by shelling a body using a **Shell** block or other methods ([nTop Learn Course](https://learn.ntop.com/courses/320-data-driven-design/)).

2. Use the **Mesh from Implicit Body** block to convert your shelled body into a mesh.

3. Next, use the **Split Mesh** block to separate the mesh into inner and outer layers.

4. Use the **Quadrangulate Mesh** block to convert the separated triangular meshes into quad meshes.

5. Use the **CAD Body from Quad Mesh** block to transform the quad mesh layers into solid CAD bodies.

6. Combine the inner and outer CAD bodies into a single part with the **Merge CAD Bodies** block.

7. Export your completed part using the Export Part block.

![](https://files.learn.ntop.com/help-articles/interop/50598744373651.png)## Example file

[Merge CAD Bodies Example](https://files.learn.ntop.com/Support%20Article%20Example%20Files/Knowledge%20Base/Interop/merge_cad_bodies_example.ntop)

## Keywords:

*cad mesh export shell bodies merge quad*