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Multiphysics models for material extrusion are extremely computationally-demanding and not feasible for the size-scales involved in scaffold structures.This paper presents a new computationally-efficient method , called the VOLume COnserving model for 3D printing ( VOLCO ) .
 manufacturing process: material extrusion; engineering feature: scaffold; concept or principle: VOLume; concept or principle: model; 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: material extrusion, scaffold, VOLume, model, 3D printing 
Answer:
 manufacturing process: material extrusion; engineering feature: scaffold; concept or principle: VOLume; concept or principle: model; manufacturing process: 3D printing