8040
Experiments were conducted on both the native 3D print and after coating with XTC-3D® , a transparent epoxy resin used to improve optical transparency of 3D prints .
 3D print, coating, transparent, epoxy, optical, 3D prints
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:
 3D print, coating, transparent, epoxy, optical, 3D prints