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An important issue that may not be neglected when applying topology optimization to scaffold design is to consider the differences in physical , chemical and mechanical properties of base materials produced by AM and conventional fabrication techniques .
 material: be; engineering feature: topology optimization; engineering feature: scaffold; engineering feature: design; concept or principle: mechanical properties; concept or principle: materials; manufacturing process: AM; manufacturing process: fabrication
Please list all entity words in the text that fit the category.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} 
Answer:
 material: be; engineering feature: topology optimization; engineering feature: scaffold; engineering feature: design; concept or principle: mechanical properties; concept or principle: materials; manufacturing process: AM; manufacturing process: fabrication