3848
Excellent fusion of the extruded polymer strands and the absence of anisotropy are achieved , as verified by microscopic imaging and measuring the tensile strength parallel and perpendicular to the 3D printing direction .
 fusion, extruded, anisotropy, as, microscopic imaging, tensile strength, 3D printing
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:
 fusion, extruded, anisotropy, as, microscopic imaging, tensile strength, 3D printing