For the experiments studying PLA degradation, we used PLA Ingeo 4043D from NatureWorks. The specimens were injected using a Babyplast 6/12 Standard microinjector at 200 • C and 90 Bar. The specimen shape is a rectangular prism of 80x13x3.2mm with slightly rounded corners for better ejection. The PLA was dried overnight at 50 • C before injection.