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In this section , all of these techniques for 3D printing of polymer-fiber composites are reviewed in detail to demonstrate their strengths and weaknesses in additive manufacturing of polymer-fiber composites .
 manufacturing process: 3D printing; material: polymer-fiber composites; machanical property: strengths; manufacturing process: additive manufacturing; material: polymer-fiber composites
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:
 manufacturing process: 3D printing; material: polymer-fiber composites; machanical property: strengths; manufacturing process: additive manufacturing; material: polymer-fiber composites