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The work presented here not only demonstrates the feasibility of a new non-melt fusion room temperature metal 3D printing approach—capable of producing metals with more than 99 percent density—but also presents both observational study and an initial theoretical basis upon which a new athermal microstructural transformation process may be understood Selective laser melting and other additive manufacturing ( AM ) techniques have recently attracted substantial interest of both researchers and the processing industry .
 feasibility, fusion, temperature, metal, 3D printing, metals, theoretical, microstructural, process, be, Selective laser melting, additive manufacturing, AM, industry
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:
 feasibility, fusion, temperature, metal, 3D printing, metals, theoretical, microstructural, process, be, Selective laser melting, additive manufacturing, AM, industry