Facets are the basis for this analysis. While increased facet refinement creates more accurate visual results, extreme facet refinement will reduce system performance. To see part facets, turn on wire settings: click File > Settings > 3D Object, and then, click the Wire check box in the Part Misc pane.

The system sets a default facet refinement based on your model. Click Less or More in the Facet Refinement section of the Wall Thickness 3D dialog box to divide or multiply the existing value by 2.

You can also enter a specific facet refinement value directly into the Max. Length field or enter a facet error value into the Max. Error field.