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In this study , the three dimensional printing ( 3DP ) AM process was investigated to determine the effect of powder layer orientation on mechanical and structural properties of fabricated parts .
 three dimensional printing, 3DP, AM process, powder, layer, mechanical, properties, fabricated
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:
 three dimensional printing, 3DP, AM process, powder, layer, mechanical, properties, fabricated