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This paper presents a novel method for 3D printing customizable optics with a soft and stretchable ( over 100 % elastic strains ) thermoplastic polymer .
 manufacturing process: 3D printing; application: optics; engineering feature: stretchable; machanical property: elastic; material: thermoplastic polymer
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: 3D printing, optics, stretchable, elastic, thermoplastic polymer 
Answer:
 manufacturing process: 3D printing; application: optics; engineering feature: stretchable; machanical property: elastic; material: thermoplastic polymer