While the plastic is still hot, it is pliable and can easily be formed into different shapes. However, as it cools, it quickly becomes solid and retains its shape. You need to achieve the correct balance between temperature and cooling so that your plastic can flow freely through the nozzle, but it can quickly solidify to maintain the exact dimensions of your 3D printed part. If this balance is not achieved, you may start to notice some print quality issues where the exterior of your part is not as precise and defined as you would like. As you can see in the image below, the filament extruded was not able to cool quickly enough to retain its shape. The section below will examine several common causes for overheating and how to prevent them.
1、Printing at too high of a temperature
If you are already using a cooling fan and you are still seeing this issue, you may want to try printing at a lower temperature. If the plastic is extruded at a lower temperature it will be able to solidify faster and retain its shape. Try lowering the print temperature by 5-10 degrees to see if it helps. You can do this by clicking “Settings——Basic” and selecting the Temperature tab. Simply click the temperature setpoint you wish to change. Be careful not to lower the temperature too far, as otherwise the plastic may not be hot enough to extrude through the small opening in your nozzle.
2、Printing too fast
If you are printing each layer very quickly, you might not allow enough time for the previous layer to properly cool before you are trying to deposit the next layer of hot plastic on top of it. This is particularly important for very small parts where each layer only requires a few seconds to print. Sometimes, you may still need to decrease the printing speed for these small layers to ensure you provide enough time for the layer to solidify. Thankfully, C4M includes a very simple option to do exactly that. Click on “Settings——Print Speed” to adjust the printing speed for layers that take less than 15 seconds to print, the program will automatically slow down the printing speed for these small layers.