1002
In the context of polymer extrusion based additive manufacturing , post-process approaches , such as thermal annealing have been reported for improving mechanical properties based on reptation of polymer chains and enhanced filament-to-filament adhesion .
 polymer extrusion, additive manufacturing, post-process, as, annealing, mechanical properties, polymer, adhesion
Please list all entity words in the text that fit the category. Output format is "word1, 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} 
Answer:
 polymer extrusion, additive manufacturing, post-process, as, annealing, mechanical properties, polymer, adhesion