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Additive manufacturing has experienced a remarkably growth over the last few years , making possible not only to make prototypes , but also to produce final products , so nowadays most of recent works are focused in metal additive manufacturing .
 manufacturing process: Additive manufacturing; concept or principle: prototypes; manufacturing process: metal additive manufacturing
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: Additive manufacturing; concept or principle: prototypes; manufacturing process: metal additive manufacturing