Question

stereolithography (sla)
use the information below to answer the question.
stereolithography (sla) is the oldest type of 3d printing and is one of the vat
polymerization processes. in this process, a vat is filled with liquid resin and a solid-
state laser is used to cure the material, layer by layer. there are two common
configurations used: top - down and bottom - up.
bottom - up printing process
in the bottom - up version, the base of the container has a transparent bottom.
underneath the vat, a laser is positioned upwards, aimed to shine up through the clear
base. the printer uses two mirrors to aim the laser beam at specific points along the x
and y axis, as dictated by the design program. when the light hits the resin, the
material cures onto the build plate, creating a layer. the build plate will then rise, let
more resin in, and then go back down. the same pattern will continue to repeat until
the print is complete.
washing and curing
once the form has been printed, it will need a final wash and curing. the wash will
remove the uncured resin and a (uv) light source is used to fully harden the form. this
can be done manually or by using a proprietary washing and curing machine that
comes with most printers.
if you do not have access to a washing and curing machine, you can manually wash the
prints in a bin of water. after youve removed the access resin, the water should be
placed under a (uv) source, such as direct sunlight, to cure the leftover resin. once
the material has cured, you will be able to gather up the waste material and dispose of
it properly. sunlight can also be used on your printed form to cure it for the final time.
what is a necessary step when washing and curing a
stereolithography print manually?
leaving the print on one side while it cures
raising the pressure exerted on the print
using acetone to strip the print
disposing the waste material properly

Explanation:

The text mentions that after washing and curing manually (washing in water bin to remove resin, then curing under UV source like sunlight), gathering and properly disposing of waste material is part of the process. The other options: leaving print on one side while curing isn't mentioned as a manual - washing - and - curing step; raising pressure on print isn't in the text; using acetone isn't described in the manual washing (water is used).

Answer:

disposing the waste material properly