Description of the problem: Once the print is completed if the layers do not adhere to each other consistently resulting in horizontal cracks. Some layers may even start to peel off.
Material: Any type of material.
Layer adhesion is dependent on the extrusion temperature. Try to raise both the bed and extruder temperatures by 5 to 10C to increase layer adhesion. Older filament not stored properly can absorb moisture. To avoid moisture absorption, store your filament in a cool, dark and dry place, such as a sealed container with a few packs of desiccant. We use the Polybox to aid in keeping our filament dry. Consider ordering one from us with your next filament purchase.
See this article about setting optimal temperatures