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In this process , a filament of a paste is extruded through a nozzle while it moves over a platform , building the object layer-by-layer .
 concept or principle: process; material: filament; manufacturing process: extruded; machine or equipment: nozzle; machine or equipment: platform; concept or principle: layer-by-layer
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: process; material: filament; manufacturing process: extruded; machine or equipment: nozzle; machine or equipment: platform; concept or principle: layer-by-layer