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The integration of coaxial connectors into the filter and waveguide designs via 3D printing eliminates the need for two additional bulky external SMA-to-waveguide transitions , and allows for customizable integrated SMA-to-waveguide transitions that minimize impedance mismatch .
 application: filter; engineering feature: designs; manufacturing process: 3D printing
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: filter, designs, 3D printing 
Answer:
 application: filter; engineering feature: designs; manufacturing process: 3D printing