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On the other hand , FEM is a powerful tool to analyze composite structures , and it can be applied for 3D printing with slight modifications of existing finite element models .
 concept or principle: FEM; machine or equipment: tool; concept or principle: composite structures; material: be; manufacturing process: 3D printing; concept or principle: finite element models
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: FEM; machine or equipment: tool; concept or principle: composite structures; material: be; manufacturing process: 3D printing; concept or principle: finite element models