Question

fused filament fabrication (fff)
use the information below to answer the question.
fused filament fabrication (fff) is one of the most common types of printers used
today as it is the least expensive type of machine and prints using the most affordable
types of material.
the way the print bed and print head will move, varies depending on what type of
model you use. in this example, the print bed can only move back and forth, while the
print head can move up and down as well as side to side.
what is one of the main reasons fff printers are so
commonly used today?
these printers use a misting applicator to cool down parts.
these are the least expensive type of printers.
these printers do not require heat.

Explanation:

The text clearly states that FFF is one of the most common types of printers used today because it is the least expensive type of machine. The other options (using a misting applicator to cool down parts and not requiring heat) are not mentioned in the provided information as reasons for its common use.

Answer:

These are the least expensive type of printers.