Fracture mechanisms of additively manufactured polylactide: Effect of in vitro hydrolytic degradation

•Fracture behaviour of 3D-printed PLA during hydrolysis at 37 °C were analysed.•Fracture surfaces of the interface between layers were examined.•Striations and localised ductility significantly changed during degradation.•Critical levels of Mw and crystallinity caused brittle-ductile transition.•Accelerated degradation can predict fracture behaviour of PLA at 37 °C.