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The current limits of each design approach are discussed and the most exciting future opportunities for biomimetic AM applications are highlighted .
 concept or principle: limits; engineering feature: design; application: biomimetic AM applications
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:
 concept or principle: limits; engineering feature: design; application: biomimetic AM applications