Every time the printing process, the 3D printer must melt and extrude a lot of kilograms of plastic. In order to be able to manufacture complex things, all plastics must leave the extruder from this small hole with only a large amount of sand. Inevitably, there is some error in this process at some point, which prevents the extruder from extruding plastic from the nozzle. This congestion or blockage is usually caused by the fact that something in the nozzle blocks the free extrusion of the plastic. If you encounter such a problem, the novice will naturally feel a headache, then we will introduce some simple troubleshooting steps to repair the blocked nozzle.
Manually push the consumable into the extruder: The first thing you should try is to manually push the consumable into the extruder. The extruder is heated to a temperature suitable for the plastic, and then a small amount of plastic is extruded using a liquid crystal screen control extruder, for example 10 mm, and a machine without a liquid crystal screen can be controlled using Cura. When the extruder motor begins to rotate, gently push the consumable into the extruder by hand. Many times, this additional force will be enough to force the consumables through the problem area. Reload the consumables: If the consumables still do not move, what you should do next is to uninstall the consumables. Make sure the extruder is heated to the proper temperature and then use the LCD to control the withdrawal of the consumables from the extruder. Machines without a LCD can be controlled using Cura. As before, you may need to apply a little extra force if the consumables don't move. When the consumables are drawn out, use scissors to cut off some of the melted or destroyed parts. Then reload the supplies and see if your extruder can squeeze out new, undamaged consumables. Clean the nozzle: If the new consumables still can't be squeezed out, it seems that you only have to clean the nozzles before you can continue printing. Many users have successfully solved this problem by heating the extruder to 100 degrees and then manually withdrawing the consumables, which is promising to pull out the plugs in the nozzles. Or use a medical silver needle to reverse the nozzle, the 0.4mm nozzle can be used with a 0.35mm diameter silver needle, and so on. The E string of the guitar can also be used. There may be many other methods, and different extruders will be different, so please consult your printer manufacturer for an accurate description.