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These three are shown in 3 , using the examples of a direct replication of a structure printed on an entry-level FDM printer , a reverse-engineered design based on measurements taken from a natural structure and a generic bio-inspiration example in which honeycomb structures are used as light-weight design .
 concept or principle: direct replication; concept or principle: structure; machine or equipment: FDM printer; engineering feature: design; concept or principle: structure; concept or principle: bio-inspiration; engineering feature: honeycomb structures; material: as; engineering feature: design
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: direct replication; concept or principle: structure; machine or equipment: FDM printer; engineering feature: design; concept or principle: structure; concept or principle: bio-inspiration; engineering feature: honeycomb structures; material: as; engineering feature: design