Question

pbf: post - processing
use the information below to answer the question.
heat treating
the post - processing step for powder bed fusion (pbf) prints is to use heat treating. heating the metal of the print and then quickly cooling it down removes any internal stresses within the metal. this reduces the chance of it affecting the performance of the piece.
support material
another step of post - processing for powder bed fusion (pbf) prints involves the support material. the support material has to be removed by the operator using a grinder once the part is complete. after the support material is removed, traditional machining techniques can be used such as welding, grinding, or polishing. a subtractive manufacturing process can be done as well, whereby a cnc machine removes material. sandblasting, electroplating, or micro - polishing can be done during post - processing as well.
what must be done with the support material for powder bed fusion (pbf) prints once they are completed?
it must be dissolved.
there is no support material for powder bed fusion (pbf) prints.
it must be removed.
it must be recycled.

Explanation:

The text clearly states that another post - processing step for Powder Bed Fusion (PBF) prints involves the support material which has to be removed by the operator using a grinder once the part is complete.

Answer:

It must be removed