2021
Direct printing of microstructures using material jetting based additive manufacturing ( 3D printing ) onto PMMA substrates .
 material: microstructures; manufacturing process: material jetting; manufacturing process: additive manufacturing; manufacturing process: 3D printing
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: microstructures, material jetting, additive manufacturing, 3D printing 
Answer:
 material: microstructures; manufacturing process: material jetting; manufacturing process: additive manufacturing; manufacturing process: 3D printing