Figure 8. Surface roughness of inner faces at different angular measurement and different process parameters

From

How Surface Roughness Performance of Printed Parts Manufactured by Desktop FDM 3D Printer with PLA+ is Influenced by Measuring Direction

Mohammad S. Alsoufi, Abdulrhman E. Elsayed

American Journal of Mechanical Engineering. 2017, 5(5), 211-222 doi:10.12691/ajme-5-5-4