5135
In addition , the use of waste materials in additive manufacturing in the private sector would reduce cost and increase sustainability , providing a high-value output for used plastics .
 materials, additive manufacturing, sustainability, plastics
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 materials, additive manufacturing, sustainability, plastics