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Fused Filament Fabrication ( FFF ) is a popular additive manufacturing technique where molten polymer filament is applied in a raster pattern , layer by layer , to obtain the work piece .
 manufacturing process: Fused Filament Fabrication; manufacturing process: FFF; manufacturing process: additive manufacturing; material: polymer filament; process parameter: raster pattern; concept or principle: layer by layer; machine or equipment: work piece
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: Fused Filament Fabrication, FFF, additive manufacturing, polymer filament, raster pattern, layer by layer, work piece 
Answer:
 manufacturing process: Fused Filament Fabrication; manufacturing process: FFF; manufacturing process: additive manufacturing; material: polymer filament; process parameter: raster pattern; concept or principle: layer by layer; machine or equipment: work piece