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Multi-material extrusion in 3D printing is gaining attention due to a wide range of possibilities that it provides , specially driven by the commercial availability of a large variety of non-conventional filament materials .
 concept or principle: Multi-material; manufacturing process: extrusion; manufacturing process: 3D printing; process parameter: range; material: filament
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: Multi-material, extrusion, 3D printing, range, filament 
Answer:
 concept or principle: Multi-material; manufacturing process: extrusion; manufacturing process: 3D printing; process parameter: range; material: filament