Question

fff: types of support
use the information below to answer the question.
there are two types of support structures with fused filament fabrication (fff):
dissolvable and standard.
dissolvable
dissolvable support is available if the user has a dual spool fff machine, or when they
upload the file. dissolvable filament is used with the main filament to create the fff
design without any detrimental effect on the surface design.
pva is a water - soluble support material that goes well with pla. abs and hips require
a chemical and alcohol to dissolve, so it is better to avoid this unless there is a specific
strength issue needed.
standard
with the standard structure, the support material is made out of the same build
material. there are two options available: tree structure or accordion.
tree structure has minimal impact on the surface. it is also good for minimizing post -
processing.
accordion structure is the default. it can be influenced through the slicer to get it
down to the minimum support needed. this helps to reduce the impact. if the surface
condition is not a concern, the program - generated accordion support structure can be
used.
why is it better to avoid using abs and hips support
structures for fused filament fabrication (fff)?
they have a high impact on surface finish.
they require chemicals and alcohol to dissolve.
they are not cost - effective.
they can dissolve in water.

Explanation:

The text states that PVA is a water - soluble support material that works well with PLA. It also mentions that ABS and HIPS require chemicals and alcohol to dissolve. This implies that using ABS and HIPS support structures would be more complex and potentially more hazardous due to the need for chemicals and alcohol for dissolution.

Answer:

They require chemicals and alcohol to dissolve.