Three-Dimensional Printed PLA and PLA/PHA Dumbbell-Shaped Specimens: Material Defects and Their Impact on Degradation Behavior oleh Joanna Rydz, Jakub Włodarczyk, Jennifer Gonzalez Ausejo, Marta Musioł, Wanda Sikorska, Michał Sobota, Anna Hercog, Khadar Duale, Henryk Janeczek