When you export to STL format, you may need to make some adjustments in the Export options dependent on the level of smoothness you desire for your model.

**Output**:

The

**Units**: option selects a unit type from the [Use Design Units], millimeters, centimeters, meters, inches or feet optionsThe

**Format**: option selects a format type from the Binary or ASCII options, with Binary typically being smaller than ASCII files and calculating faster in third party programs

**Faceting Parameters:**

STL files will break down any curved faces of your model into Facets so it is easier to compute. The **Faceting Parameters** in STL Export options will determine how many facets are used to generate said curved geometry.

The

**Normal Deviation**: option toggles whether or not normal deviation is used for faceting parameters which determines how accurately facets are shown in a model which can be advantageous since it does not affect the overall size of a file.

The slider bar for the **Normal Deviation** option has 10 predefined limits between the values of 0.5 and 40. Enabling the **Custom** option will make the slider inaccessible but allows any positive value over 0.5 to be entered.

The

**Surface Deviation**: option toggles whether or not surface deviation is used for faceting parameters which determines how accurately facets are shown in a model based on the distance between facets and the surface they represent

The value of **Surface Deviation** depends on the size of the model which is a fraction of the diagonal length of the bounding box of a face and is independent of the units of measurement of a face. The slider bar for the **Surface Deviation** option has 10 predefined limits between the values of 0.001 and .05. Enabling the **Custom **option will make the slider inaccessible and allows any positive value over .0000001 to be entered.

The

**Maximum Cell Size**: option toggles whether or not maximum cell size is used for faceting parameters which determines the edge length of the triangles that make up surfaces of a model and since a facet cannot be larger than a cell, the maximum size of a facet can be determined with this option with larger values creating larger facets and thus a more coarse model and smaller values creating smaller facets, more smooth facets and a larger file size.

The default value of the **Maximum Cell Size** option is set to 0 with the option disabled. If the value of this option is zero then the maximum edge length is not considered during faceting. The slider bar for the **Maximum Cell Size** option has 10 predefined limits between the values of 0.05 and 4. Enabling the **Custom **option will make the slider inaccessible and allows any positive value over .0000001 to be entered.