It’s recommended to use a flexible material (PETG, BDP, etc.). PLA breaks too quickly. The bending part needs to be as thin as possible in order to last for a while - larger thickness will cause more stress and fail sooner. Bending thickness of stl-files is either 0.2mm or 0.3mm.
For 3d-printing select slicing layer thickness of 0.1mm or 0.15mm so the hinge has 2 thin layers at the bending part.
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