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​3D printing works by building the object one layer at a time. If the layers do not bond together well enough, the final part may split or separate. We will examine several typical causes for this below and provide suggestions for resolving each one.

1. Layer height is too large

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As a general rule of thumb, you want to make sure that the layer height you select is 40% smaller than your nozzle diameter. For example, if you have a 0.4mm nozzle, you can’t go too far past a layer height of 0.24mm, or each layer of plastic will not be able to properly bond to the layer beneath it. So if you notice that your prints are separating and the layers are not sticking together, the first thing you should check is your layer height compared to the size of your nozzle.

2. Print temperature is too low

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If you notice that your layers aren’t bonding together and you are certain that your layer height isn’t too large, then it is possible that your filament needs to be printed at a higher temperature to create a strong bond. For example, if you tried to print ABS plastic at 190C, you would likely find that the layers of your part will easily break apart. This is because ABS typically needs to be printed around 220-235C to create a strong bond between the layers of your print. So if you feel this may be the problem, verify that you are using the correct temperature for the filament you have purchased. Try increasing the temperature by 10 degrees to see if the adhesion improves.

3. Warpage of each filaments

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As you start printing larger models, you may start to notice that even though the first few layers of your part successfully adhered to the bed, later on the part begins to curl and deform. This curling can be so severe that it actually causes part of your model to separate from the bed, and may cause the entire print to eventually fail. This behavior is particular common when printing very large or very long parts with high temperature materials. Please use lower warp filament like PLA, or maintain the chamber temperature. However, please consider warpage is unique characteristics of plastic filaments