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Therefore , medical additive manufacturing techniques are developed for fabrication of such implants , but currently do not achieve the required printing resolution .
 medical, additive manufacturing, fabrication, implants, resolution
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:
 medical, additive manufacturing, fabrication, implants, resolution