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Since CNC gel is derived from forestry products and is entirely water based , the 3D printing process was also made more environmentally friendly , sustainable , and potentially recyclable .
 CNC gel, 3D printing, sustainable, recyclable
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:
 CNC gel, 3D printing, sustainable, recyclable