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In the present work , a novel direct energy deposition method for metal additive manufacturing is developed employing laminar plasma as the heat source .
 manufacturing process: direct energy deposition; manufacturing process: metal additive manufacturing; concept or principle: plasma; material: as; concept or principle: heat source
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: direct energy deposition; manufacturing process: metal additive manufacturing; concept or principle: plasma; material: as; concept or principle: heat source