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Metallization has been widely used to enhance the aesthetics and performance of injection molded plastic parts , but the techniques have not been widely extended to 3D printed parts due to intrinsic differences in surface chemistry and morphology .
 Metallization, performance, plastic, 3D printed parts, surface, chemistry, morphology
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:
 Metallization, performance, plastic, 3D printed parts, surface, chemistry, morphology