3D printed objects are items created using a process called additive manufacturing. This technique involves layering materials, such as plastic or metal, to build a three-dimensional shape from a digital design. The printer follows precise instructions to add material layer by layer until the final object is complete. These objects can range from simple toys to complex components used in industries like aerospace and healthcare. The versatility of 3D printing allows for rapid prototyping, customization, and the ability to create intricate designs that would be difficult or impossible to achieve with traditional manufacturing methods.