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For example , metal particles can be added to photopolymers in vat photopolymerisation or mixed with polymer powder in powder bed fusion or with filament in material extrusion .
 material: metal; material: be; material: photopolymers; manufacturing process: vat photopolymerisation; material: polymer; manufacturing process: powder bed fusion; material: filament; manufacturing process: material extrusion
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:
 material: metal; material: be; material: photopolymers; manufacturing process: vat photopolymerisation; material: polymer; manufacturing process: powder bed fusion; material: filament; manufacturing process: material extrusion