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The cost estimations are based on reviews of the cost price for obtaining an AM part through commercial service providers and focused on both plastic and metallic parts .
 concept or principle: cost estimations; machine or equipment: AM part; material: plastic and metallic parts
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: 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:
 concept or principle: cost estimations; machine or equipment: AM part; material: plastic and metallic parts