Which of the following is a common material used in additive manufacturing?

The most common material used in additive manufacturing is polymer. Polymers are favored in various additive manufacturing processes due to their versatility, availability, and ability to be easily processed. They can be used in a range of applications, from prototyping to end-use parts, and can be tailored for specific mechanical and thermal properties by altering their chemical structure.

Polymers, such as thermoplastics, are widely used in popular additive manufacturing techniques like Fused Deposition Modeling (FDM) and Selective Laser Sintering (SLS). They can also be used in more advanced processes such as PolyJet and stereolithography, where they can create highly detailed and complex shapes with desired attributes.

While aluminum is indeed used in additive manufacturing, especially in metal 3D printing applications, it is not as commonly utilized as polymers for the majority of consumer and industrial applications within the field. Wood and glass are significantly less common due to limitations in their processing capabilities and the specific complexities that arise in using these materials in additive manufacturing.