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Furthermore , developments in 3D printing of fiber reinforced composite structures allowed precise placement of material at micro-scale , to fabricate complex structures in 4D printing of active composites , with ability to transform over time , right after the 3D printing .
 manufacturing process: 3D printing; material: fiber reinforced composite structures; material: material; concept or principle: micro-scale; manufacturing process: fabricate; concept or principle: complex structures; manufacturing process: 4D printing; material: active composites; manufacturing process: 3D printing
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: fiber reinforced composite structures; material: material; concept or principle: micro-scale; manufacturing process: fabricate; concept or principle: complex structures; manufacturing process: 4D printing; material: active composites; manufacturing process: 3D printing