Question

sls: layer adhesion
use the information below to answer the question.
sls printing has excellent layer adhesion. it is a good option for prototyping and
production of injection mold applications. it also has good chemical resistance.
hybrid material
sls creates parts with good tensile strength and mechanical properties. occasionally,
carbon or glass fiber is introduced into the build. this can change the material
properties of the form. portions of a form that contain additives become stronger in
tension and weaker in compression.
porous material
printed parts for sls are about 30% porous, which can make them brittle in some
cases. however, this characteristic also means the material can absorb dye, similar to
the way a sponge might absorb water. when \coloring\ a form, it is generally done
during the post - processing stage.
possible failure
it is important to be aware of any issues that may occur during an sls build. a
commonly known problem is called delamination. this is when there isnt enough light
or heat. delamination often occurs when the laser is underpowered, or something is
obstructing the light getting to the powder bed. for instance, the mirror might be
cloudy, or there might be a smudge on the lens.
resolving issues
if issues are manifested in your build, you will want to first check for anything that
may be obstructing the lasers path to the powder. follow the manufacturers
instructions. wear gloves, and dont use pressurized air. spraying parts with air may
create a dangerous cloud of powder.
what is delamination?
when an sls bin runs out of space
when there isnt enough powder to create an sls form
when an sls print is scaled down
when there isnt enough light or heat for an sls print

Explanation:

According to the text, delamination is when there isn't enough light or heat. It often occurs when the laser is underpowered or something is obstructing the light getting to the powder bed. Among the options, the one that matches this description is "when there isn't enough light or heat for an SLS print".

Answer:

when there isn't enough light or heat for an SLS print