As we all know, 3D printing builds the model by layer printing, and each subsequent layer is printed on the previous layer, and finally builds the desired 3D shape. However, in the printing process, if the layers cannot be well bonded together, there will be cracking or disconnection. Why do these phenomena occur? And how can we solve the phenomenon of cracking or fault? Let's answer the relevant questions.1. The floor height is too highSolution: reduce the layer height in the slicing softwareNote: Most 3D printers have nozzle diameters of 0.3 to 0.5mm When you print another layer on one layer, you need to make sure that the new layer is squeezed onto the lower layer so that the two layers can be glued together.2. In general, you need to make sure that the layer height you choose is 20% smaller than the nozzle diameter. For example, if your nozzle diameter is 0.4mm, the layer height you use cannot exceed 0.32mm, otherwise, the plastic on each layer will not be able to bond with the layer below it. The appropriate layer height is generally set between 0.1-0.24mm (generally we use 0.1-0.2mm), which can guarantee the surface accuracy of the model, and the adhesion is very good. So, if you find that the print is cracked and the layers are not glued 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 adhere better.3. The printing temperature is too lowSolutions: 1. Adjust the temperature in the software; 2. Turn up the temperature when printing. When printing, click to enter the main menu and click adjust to set the nozzle temperatureExplanation: compared with cold consumables, hot consumables always stick together better. If you find that the layer to layer bonding is not good, and you can be sure that the layer height setting is not too high, then it may be your wire that needs to print at a higher temperature to better bond. For example, if you try to print ABS plastic at 190 degrees Celsius, you may find it easy to separate layers from layers. This is because ABS generally needs to print at 230 to 260 degrees Celsius, so that the layers and layers can be effectively bonded. So if you think this may be the problem, make sure that you have used the correct printing temperature for the consumables you purchased. Try to increase the temperature by 10 degrees centigrade each time to see if the adhesion is improved.4. The printing speed is too fast and the wall thickness is too thinSolution: adjust printing speed and wall thickness in slicing softwareNote: at the same time ratio speed, it can be imagined that there must be a certain difference between the adhesion degree of the model printed at the speed of 100 mm / s and that of the model layer printed at the speed of 50 mm / s in the same time. The same is true for wall thickness. Compared with 1.2mm, 0.4mm wall thickness is easy to tear and split, but it is not so easy for 1.2mm wall thickness. If it is cold in winter, too thin wall thickness is more likely to split. (Note: proper printing speed and appropriate wall thickness and filling can effectively avoid model layer splitting.The above is the relevant solution, hope to help you!