1892
Although the 2D or 3D TO produced structures could be printed by polymer AM processes , the direct application of the existing non-tailored TO may have difficulty using metallic AM .
 concept or principle: 2D; concept or principle: 3D; material: be; material: polymer; manufacturing process: AM processes; manufacturing process: metallic AM
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: 2D; concept or principle: 3D; material: be; material: polymer; manufacturing process: AM processes; manufacturing process: metallic AM