Question

fff: repairing 3d files
use the information below to answer the question
sometimes when going from 3d modeling to the printing software, there is geometry
that isnt quite right. this needs to be adjusted or changed in order to print. there are
software programs that can be downloaded for free to clean up a file to get it ready
for printing. the software often includes editing tools as well. the software will flip
or reverse the normal. in geometry, a normal refers to two elements that are at 90
degrees to each other. if the geometry is facing out, it needs to be flipped in. the
object also needs to be watertight. there cant be any holes or missing pieces in the
mesh. it must have a continuous geometry all the way around. (this does not refer to
holes that have been designed in.)
in terms of repairing a 3d print file, which of the following is
true?
repair software is generally expensive.
the object needs to be watertight.
geometry facing out needs to be shifted to the right
geometry facing out needs to be shifted to the left

Explanation:

The text states repair software can be downloaded for free (so "generally expensive" is false), geometry facing out needs to be flipped in (not shifted right/left), and the object must be watertight (no holes/missing pieces in the mesh).

Answer:

The object needs to be watertight.