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3D printing ( 3DP ) is a two-step additive manufacturing technique ( AM ) in which additively manufactured green parts in the first step are transformed into functional parts during the second step .
 3D printing, 3DP, additive manufacturing, AM, additively manufactured, step, step
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:
 3D printing, 3DP, additive manufacturing, AM, additively manufactured, step, step