3D printers can use a variety of materials, including plastics, metals, and composites. Here is a summary of the most common materials used in 3D printing:

• Plastics: Plastic is the most common material used in 3D printing. It is versatile and comes in a variety of colors and textures. The most common types of plastic used in 3D printing are ABS and PLA, but there are many other types available.

• Metals: Metal is another popular material used in 3D printing. Direct metal laser sintering (DMLS) is a common process used to 3D print metal parts. This process is used to create parts for aerospace and industrial machinery components, among other applications.

• Composites: Composite materials are desirable for their high degrees of strength and stability, as well as their optimal strength-to-weight ratios. Composite fibers are very lightweight, which means they can bring great strength to a part without adding to its mass. Common base materials used in composites include PLA and ABS, which are both quite popular.

• Wood: Wood is a newer material used in 3D printing. It is used to create composites that can mimic materials like marble, ceramic, and wood.

• Concrete: Concrete is another material that is being used in 3D printing. It is used to create large-scale structures, such as buildings and bridges.

• Carbon fiber: Carbon fiber particles can be added to standard 3D printing materials like ABS, PLA, or PETG to increase the materials strength. However, carbon-fiber-filled plastics tend to clog the printing nozzle and can accelerate wear on standard 3D printing nozzles.

Overall, the materials used in 3D printing are constantly evolving, and new materials are being developed all the time.