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The key barrier to offering high-temperature environments for desktop-scale FFF systems in a cost-effective manner is that the electrical components must be compatible with , protected from , or removed from environments exceeding 100 °C.To enable desktop-scale FFF printing of high-performance polymers at a low cost and high quality , the authors present a novel inverted FFF system design that provides a build environment of up to 400 °C .
 manufacturing process: FFF; application: electrical; machine or equipment: components; material: be; manufacturing process: FFF; material: polymers; concept or principle: quality; manufacturing process: FFF; engineering feature: design; process parameter: build
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: FFF, electrical, components, be, FFF, polymers, quality, FFF, design, build 
Answer:
 manufacturing process: FFF; application: electrical; machine or equipment: components; material: be; manufacturing process: FFF; material: polymers; concept or principle: quality; manufacturing process: FFF; engineering feature: design; process parameter: build