There are many materials that can be used for 3D printing, some of the most common ones include:

1. Plastics: ABS (Acrylonitrile Butadiene Styrene) and PLA (Polylactic Acid) are the most commonly used plastics for 3D printing. ABS is a thermoplastic that is tough, durable, and heat-resistant, making it well-suited for functional parts and prototypes. PLA is a biodegradable plastic that is easy to print with and produces little odor during printing.

2. Metals: 3D printing with metal is becoming increasingly popular, as it allows for the creation of complex and detailed parts. Some of the metals that can be used for 3D printing include steel, titanium, aluminum, and gold.

3. Resins: Resin-based 3D printing, also known as Stereolithography (SLA), uses liquid resins that are cured by UV light. The resins can be clear or colored, and they produce high-resolution, highly detailed prints.

4. Ceramics: 3D printing with ceramics is a recent development, and the process is still in its early stages. Ceramic 3D printing allows for the creation of detailed and delicate parts, but the technology is still relatively expensive.

5. Other materials: 3D printing technology is advancing rapidly, and new materials are being developed all the time. Some of the other materials that are being used or developed for 3D printing include wood, glass, and rubber.

It is important to note that the choice of material will depend on the application and the 3D printing technology used. Each material has its own properties and limitations, and it’s important to choose the right material for the job.