Computer Science for IGCSE & O level - Hardware (Section 2 - No. 32)

In the context of 3D printing, what does 'layer by layer' refer to?

Printing one entire layer of a component at a time.

The process of building an object by adding thin horizontal slices on top of one another.

The direction the print head moves during printing.

The method of layering colors to create an image.

3D printing builds objects by sequentially depositing material in very thin layers.