Why are STL files crucial in the additive manufacturing process?

STL files are crucial in the additive manufacturing process because they primarily represent the three-dimensional geometry of the object to be printed. They contain information about the surface topology of the model in a format that is easy for 3D printers to interpret. When a 3D printer works with an STL file, it essentially understands the outer shape of the object, allowing it to create layers that are precisely aligned to build the physical item layer by layer.

The effective communication of geometry in STL files is what makes them essential for producing accurate 3D prints. The layering structure mentioned is a natural consequence of this geometry, as each slice of the model is translated into a layer during the printing process. This ultimately guides the printer in determining how to construct the part, ensuring that the shape and dimensions are preserved through the additive manufacturing process.