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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 .
 engineering feature: designed; manufacturing process: 3D printing; concept or principle: prototypes; manufacturing process: selective laser melting; application: medical; machanical property: strength; material: alloy; material: Ti-6Al-4V; material: metallic clay
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: 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} 
 Entities: designed, 3D printing, prototypes, selective laser melting, medical, strength, alloy, Ti-6Al-4V, metallic clay 
Answer:
 engineering feature: designed; manufacturing process: 3D printing; concept or principle: prototypes; manufacturing process: selective laser melting; application: medical; machanical property: strength; material: alloy; material: Ti-6Al-4V; material: metallic clay