Question

3d printing material groups
use the information below to answer the question.
the majority of 3d printed materials are made out of either metal or polymers.
comparing material properties
choosing the right material for your project is an essential step in the 3d printing
process. to ensure you choose the material that will be most suitable for your project,
you should consider what environment and design constraints you have in order to
meet the durability and performance requirements.
some 3d printing materials have additives or fillers mixed in them.
common fillers & additives

1. ceramic
2. carbon
3. aluminum
4. fiberglass
5. wood
6. bronze

fillers like wood and bronze can give your piece a unique, artistic look. bronze material
has specific properties that allows your project to get a patina coating. this look is
often used in cold cast bronze sculptures.
patina is when the surface of bronze or other similar metals oxidizes and creates a
green or brown film on the outside.
designing considerations
its a good idea to keep in mind what material youre planning to use for your project
as that will inform your design. as you are creating your design, there will be certain
modifications youll make to your 3d model based on what material you use.
sometimes you have situations where youll want to make your form hollow or lighter.
this can be accomplished by creating exit holes for the excess material to be released.
in certain technologies, you can take advantage of these escape holes to reuse the
loose powder or resin that was not formed into the printed object.
what is it called when the surface of bronze or other similar
metals oxidizes and creates a green or brown film on the
outside?
patina
enhancement
coloration

Explanation:

The text directly states that "Patina is when the surface of bronze or other similar metals oxidizes and creates a green or brown film on the outside."

Answer:

patina