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To realize the full potential of 3D Printing technology in the design of materials and structures , it is indispensable to characterize and predict the mechanical response of 3D Printing materials to external stimuli .
 enabling technology: 3D Printing technology; engineering feature: design; concept or principle: materials; concept or principle: mechanical response; manufacturing process: 3D Printing; concept or principle: external stimuli
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: 3D Printing technology, design, materials, mechanical response, 3D Printing, external stimuli 
Answer:
 enabling technology: 3D Printing technology; engineering feature: design; concept or principle: materials; concept or principle: mechanical response; manufacturing process: 3D Printing; concept or principle: external stimuli