Insufficient heat dissipation:
The reason for the overheating in most cases is because the plastic is not cooled at a fast enough speed. This will cause the thermoplastic to freely change shape during slow cooling. Many plastics cool quickly after printing and are much better in terms of deformation. If your printer has a cooling fan, try increasing the power of the fan to make the plastic cool faster. In the Cura, click on the menu "Advanced Options -> Open Expert Settings" to open the Expert Settings window and set the desired fan speed in "Maximum Fan Speed". Additional heat dissipation will help the plastic retain its shape. If you don't have a cooling fan on your printer, consider installing one yourself or using a hand-held fan to speed up cooling.
The temperature setting is too high when printing:
If you have cooled down with a cooling fan, the problem is still there, then you may need to try printing at a lower temperature. If the plastic is extruded at a lower temperature it will harden harder and retain its shape. Try 5-10 degrees to lower the print temperature to see if it helps. Change the print temperature via the “Print Temperature” item on the “Basic” page. Be careful not to adjust the temperature too low, otherwise it may not be able to squeeze out.
Print too fast
If each layer prints quickly, there is no guarantee that the previous layer will have the proper cooling time when printing this layer on top of the previous layer. This is especially important when the prints are small and each layer takes only a few seconds to print. Even with a cooling fan, you should reduce the printing speed to cover the curing time of the layer when printing a small area. Fortunately, Cura includes a very simple option to support this situation. The "Minimum Time Per Layer" option on the Advanced page is used to automatically reduce the print speed when printing small areas to ensure that these layers have enough cooldown to cure to print the next layer on them. For example, “Minimum time per layer” is set to 15 seconds, and Cura will automatically reduce the printing speed when the printing time of one layer is less than 15 seconds. This is a crucial feature for dealing with overheating issues.
When these are not valid, try to print multiple prints at once:
If you have tried the above three methods and you still have difficulty in obtaining the effect of adequate cooling, you can also try a trick. Generate a copy of the thing you want to print, or import one more to print and print at the same time. By printing two things at the same time, you can also provide more cooling time for each print. When the hot nozzle moves to another position on the platform to print the second thing, it leaves a short-term chance to cool the first thing. This is also a simple but effective strategy to correct overheating problems.