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However , the coupling of the open-source 3D printers with polymer processing could potentially offer the basis for a new paradigm of distributed recycling process .
 open-source, 3D printers, polymer, recycling process
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:
 open-source, 3D printers, polymer, recycling process