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The 3D printing industry primarily involves polymers in various forms , such as reactive , liquid solutions , and thermoplastic melts .
 manufacturing process: 3D printing; material: polymers; material: as; material: thermoplastic
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: polymers; material: as; material: thermoplastic