8985
All the nine structures were printed using the fused deposition method to validate the FEM findings , while the DEWE soft data acquisition system was used to estimate the modal parameters ( i ) natural frequency and ( ii ) damping ratio .
 fused deposition, FEM, data acquisition system, parameters
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:
 fused deposition, FEM, data acquisition system, parameters