FEASIBILITY STUDY OF ULTRASONIC FREQUENCY APPLICATION ON FDM TO IMPROVE PARTS SURFACE FINISH. Jurnal Teknologi (Sciences & Engineering), [S. l.], v. 77, n. 32, 2015. DOI: 10.11113/jt.v77.6983. Disponível em: https://journals.utm.my/jurnalteknologi/article/view/6983.. Acesso em: 16 apr. 2025.