What Is a 3D Printer and How Does It Work?

A 3D printer is a manufacturing device that transforms a digital design into a physical object by adding material layer by layer. While traditional methods shape materials by cutting or machining, 3D printing uses only the material that is actually needed — which is why it is also known as “additive manufacturing.”

The process consists of three steps: first, a 3D model is prepared on a computer; then, slicing software breaks the model into thin layers and converts it into code the printer can understand. The printer then follows this code, fusing molten plastic, resin, or powder layer by layer.

In desktop FDM printers, the most common material is plastic filament wound onto spools. The filament passes through a heated nozzle and is precisely deposited onto a moving build plate, solidifying as it cools to form the finished part.