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We designed with 3D printing 17 prototypes using selective laser melting from a medical grade high strength titanium alloy ( Ti-6Al-4V ) to demonstrate the various aspects of metallic clay .
 designed, 3D printing, prototypes, selective laser melting, medical, strength, alloy, Ti-6Al-4V, metallic clay
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:
 designed, 3D printing, prototypes, selective laser melting, medical, strength, alloy, Ti-6Al-4V, metallic clay