Layer Separation and Splitting
3D printing is also known as additive manufacturing, which means building the object by adding one layer to another. If the bond between the layers are not well enough, the final part may split or separate.
Warm plastic will always bond together much better than cold plastic. Before using any filament, you should always verify that you are using the recommended temperature for the filament you have purchased. If still have this problem, you can try increasing the temperature by 10 degrees to see if it helps. You can do this by clicking “Advance” and selecting the Cooling tab to edit the temperature of the extruder. Or you can enable the heat bed and close the door and apply the top cover during printing.