1507
Dispensing of a polymer filament above its glass transition temperature is a critical step in several polymer-based additive manufacturing techniques .
 material: polymer filament; concept or principle: glass transition temperature; concept or principle: step; manufacturing process: additive manufacturing
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: polymer filament, glass transition temperature, step, additive manufacturing 
Answer:
 material: polymer filament; concept or principle: glass transition temperature; concept or principle: step; manufacturing process: additive manufacturing