What is a typical use case for a dual-extrusion FDM printer?

A typical use case for a dual-extrusion FDM printer is the creation of multi-material or multi-color objects. This capability allows manufacturers and designers to produce parts that incorporate different materials or colors within a single print. For example, combining a flexible material with a rigid one enables the production of functional prototypes that benefit from varied mechanical properties in different sections of the model. Additionally, dual-extrusion can be used to print support structures from a material that is easily removed or soluble, simplifying post-processing and enabling the fabrication of complex geometries that would be challenging to create with a single material.

While other options highlight scenarios relevant to FDM printing, they do not specifically leverage the unique advantage of dual-extrusion technology. For instance, printing single material parts or producing large-scale architectural models typically relies on single-extrusion printers, and while complex internal structures can be produced using advanced FDM techniques, dual-extrusion primarily enhances the diversity of materials and colors in a single print, thereby defining its main use case.