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This section will focus on four primary constraints that are common to all AM process categories and particularly relevant to the AM of metals : Speed of build , materials , build envelope , and accuracy .
 manufacturing process: AM process; manufacturing process: AM; material: metals; process parameter: build; concept or principle: materials; process parameter: build envelope; process characterization: accuracy
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:
 manufacturing process: AM process; manufacturing process: AM; material: metals; process parameter: build; concept or principle: materials; process parameter: build envelope; process characterization: accuracy