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This study opens up an avenue for the fabrication of large scale 3D printed lattice structures with optimal mechanical properties and without support material removing problem .
 fabrication, 3D printed, mechanical properties, support material
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:
 fabrication, 3D printed, mechanical properties, support material