Question

how do layers of plastic make an object in 3d printing? melted plastic is squeezed on top of plastic that has already been squeezed. the printer repeats this action to build an object.

Explanation:

3D printing builds objects layer - by - layer. Melted plastic is extruded on top of previously solidified plastic. To create a complete object, the printer must repeat this layering process multiple times. Stopping would not result in a fully - formed object.

Answer:

repeats