Which statement about thickness specification in shell features is true?

The correct statement is that thickness can be varied per wall. In design software, when creating shell features, users often have the ability to specify different thicknesses for each wall of the shell. This feature provides flexibility in the modeling process, allowing designers to cater to specific functional requirements or aesthetic preferences. Different wall thicknesses can enhance structural integrity, optimize material usage, and accommodate varying load conditions.

This variability is essential in complex designs where uniformity may not be practical or necessary. It allows for more sophisticated designs that can reflect real-world applications more closely, such as in cases where certain areas require more strength or insulation than others. Consequently, utilizing varied thicknesses can lead to more effective and efficient designs in engineering applications.