3D printing uses ultraviolet light or lasers to solidify or fuse materials layer by layer to produce three-dimensional objects. There are various 3D printing technologies that use different materials like resins, powders, thermoplastics, and carbon fibers. Advances are being made to improve 3D printing for mass manufacturing. While industrial 3D printers can be expensive, consumer-level 3D printers are now available for a few hundred dollars, allowing more people and classrooms to use the technology for design and production.