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Printing performance of the energetic samples was compared with standard 3D printing materials , with metrics including the bead-to-bead adhesion and surface quality of the printed samples .
 Printing performance, samples, standard, 3D printing, adhesion, surface quality, samples
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:
 Printing performance, samples, standard, 3D printing, adhesion, surface quality, samples