How to deal with the layer cracking or breaking during printing
3D printing builds models by printing one layer at a time. Each subsequent layer is printed on the previous layer, and finally the desired 3D shape is constructed. Then, in order to make the final print solid and reliable, you need to make sure that each layer is fully bonded to the layer below it. If the layers do not bond well, the final print may crack or break. Next, we will explore some typical reasons and corresponding solutions.
The floor height is too high
Most 3D printers have nozzles between 0.2 and 0.6 mm in diameter. The plastic is extruded from this small hole to form a very fine extrusion wire, which in turn builds a print with rich details. However, these small nozzles also lead to layer height limitation. When you print another layer of plastic on one layer, you need to make sure that the new layer is squeezed onto the lower layer so that the two layers can bond together. In general, you need to make sure that you choose a layer height 20% smaller than the nozzle diameter. For example, if the diameter of your nozzle is 0.4mm, the layer height you use should not exceed 0.32mm, otherwise the plastic on each layer will not bond with the layer below it correctly, and the appropriate layer height is generally set between 0.1 and 0.24, which ensures the surface accuracy of the model and has good adhesion. So, if you find that the print is cracked and the layers are not bonded together, the first thing you need to check is that the layer height matches the nozzle diameter. Try reducing the layer height to see if you can make the layers bond better.
The printing temperature is too low
Hot plastics always bond better than cold plastics. If you find that the layer to layer bonding is not good, and you can make sure that the layer height setting is not too high, it may be your wire that needs to be printed at a higher temperature in order to better bond. For example, if you try to print ABS plastic at 190 degrees Celsius, you may find it easy to separate layers. This is because ABS generally needs to be printed at 230 to 260 degrees Celsius in order to make layer to layer and strong adhesion. So if you think it may be this problem, confirm whether the correct printing temperature is used for the purchased wire. Try increasing the temperature by 10 degrees at a time to see if the adhesion improves.
The printing speed is too fast and the wall thickness is too thin
At the same time ratio speed, it can be imagined that in the same time, there must be a certain difference between the adhesion degree of the model printed at the speed of 100 mm / s and the adhesion effect of the model layers printed at the speed of 50 mm / s. The same is true for the wall thickness. Compared with the thickness of 1.2mm, the thickness of 0.4mm is easy to tear and crack, but the thickness of 1.2mm is not so easy. If it is cold in winter, too thin wall thickness is easier to split. |
