Which characteristic typically defines a model suitable for molding or casting?

A model suitable for molding or casting is typically defined by having drafted sides. Draft is an important design feature that facilitates the easy release of the part from the mold or casting. It refers to the slight taper applied to the vertical faces of the model, which helps prevent sticking and allows the mold to be opened without damaging the part. Without adequate draft angles, parts can suffer from issues such as tearing or chipping during demolding, leading to production inefficiencies and defects in the final product.

Models with vertical sides do not incorporate this important taper, making them less suitable for molding or casting processes. Hollow models might be appropriate depending on the specific application, but hollow features alone do not necessarily indicate that a model is suitable for these processes. Similarly, models with undercuts can complicate the mold design and production, as undercuts are features that can impede the mold from being removed easily from the final part. The presence of draft angles is a crucial factor that enhances the manufacturability of components in molding and casting scenarios.