Question

fff: types of infill
use the information below to answer the question about types of infill.
in the fuse filament fabrication (fff) process, infill is the structure inside of an
object that holds it together. infill is a series of repeating shapes that come
together and make a structure to support the inside of an object. this makes the
object stronger than if it was hollow, or completely filled with the filament.
how is infill used for 3d models?
used for interior structural support
used for exterior surface tension
used as a guideline for 3d models

Explanation:

The text states that infill is the structure inside an object in the FFF process, a series of repeating shapes that support the inside of an object. So, it is for interior structural support. The option "used for exterior surface tension" is incorrect as infill is inside. The option "used as a guideline for 3D models" is not mentioned in the given text.

Answer:

used for interior structural support