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Anisotropy of mechanical properties and support material removing are the two main problems when fabricating 3D lattice structures by integrated printing via additive manufacturing ( AM ) technology .
 Anisotropy, mechanical properties, support material, fabricating, 3D, additive manufacturing, AM, technology
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:
 Anisotropy, mechanical properties, support material, fabricating, 3D, additive manufacturing, AM, technology