> ## 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.

# Quadrangulate mesh fails when meshing my lattice

## Issue:

The Quadrangulate Mesh block stops at 50% or fails when meshing lattice structures.

## Applies to:

* Quadrangulate Meshing
* Exporting CAD

## Cause:

The **Quadrangulate Mesh** block isn't meant for lattice conversion. With lattices being so complex, the Quad mesh will try to run but most likely get stuck or fail. The **Quadrangulate Mesh** block was designed to use with Topology Optimization workflows.

## Solution:

The **Quadrangulate Mesh** block isn't part of the recommended lattice to CAD conversion workflow with our recent addition of the **CAD Body from Implicit Body (Beta)** block. This block is capable of converting low to medium complexity lattice structures to CAD Bodies, which can then be exported using the **Export Part** block. For more information, we recommend following [procedure 2 of this article](https://support.ntopology.com/hc/en-us/articles/7323484481555-How-to-export-geometry-as-a-CAD-part-STEP-or-Parasolid-). If you are trying to export a high complexity lattice as a CAD part, check out[this article](https://support.ntopology.com/hc/en-us/articles/7170769142291-How-to-export-a-Simplified-Body-Representation-of-Implicit-as-a-CAD-part) on the **Simplified Body Representation**block.

## Keywords:

*cad error mesh CAD lattice part meshing export body step parts lattices STEP quadrangulate quad issue stop fail*