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3.2 Constraints in structural design for additive manufacturing Although AM can theoretically produce structures in any shape , the quality of the structures may vary significantly depending on the design and fabrication parameters .
 engineering feature: structural design; manufacturing process: additive manufacturing; manufacturing process: AM; concept or principle: quality; engineering feature: design; 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:
 engineering feature: structural design; manufacturing process: additive manufacturing; manufacturing process: AM; concept or principle: quality; engineering feature: design; manufacturing process: fabrication