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Metal-filled polymers containing micro-powders of highly conductive metals can serve as a starting material to fabricate complex metal structures using economic filament extrusion-based 3D printing and molding methods .
 material: polymers; material: metals; material: as; material: material; manufacturing process: fabricate; material: metal; material: filament; manufacturing process: 3D printing; manufacturing process: molding
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: polymers, metals, as, material, fabricate, metal, filament, 3D printing, molding 
Answer:
 material: polymers; material: metals; material: as; material: material; manufacturing process: fabricate; material: metal; material: filament; manufacturing process: 3D printing; manufacturing process: molding