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It is shown that the optimal design can be fabricated by 3D printing and shows significant enhancement in natural frequency and reduction in weight .
 engineering feature: design; material: be; manufacturing process: 3D printing; concept or principle: reduction; process parameter: weight
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: design, be, 3D printing, reduction, weight 
Answer:
 engineering feature: design; material: be; manufacturing process: 3D printing; concept or principle: reduction; process parameter: weight