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Recent advances in AM made precise placement of material at micro-scale during 3D printing of complex structures possible .
 manufacturing process: AM; material: material; concept or principle: micro-scale; manufacturing process: 3D printing; concept or principle: complex structures
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: AM; material: material; concept or principle: micro-scale; manufacturing process: 3D printing; concept or principle: complex structures