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An innovative manufacturing process among the metal 3D printing techniques for stainless steel material is first introduced in Structural Engineering field .
 manufacturing process: manufacturing process; material: metal; manufacturing process: 3D printing; material: stainless steel; material: material; concept or principle: Structural Engineering
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: manufacturing process; material: metal; manufacturing process: 3D printing; material: stainless steel; material: material; concept or principle: Structural Engineering