Another common problem when it comes to 3D printing is the interruption of printing. In the form of an interruption of the filament output from the extruder, anywhere in the print. Generally there are not many causes that lead to this symptom, and as usual we will analyze them, we will examine them to find a solution.
Interruption of printing: Missing or damaged filament
The first check that runs the obligation to quote and perform is on the filament. Let’s check that the wire is not finished, we must still have some wire that enters the wire pusher.
Sometimes it can happen, if the wire is old and a bit dry, that it breaks under the tightening of the pulley of the extruder motor, without moving. We will find ourselves to see the filament entering, our engine turning but nothing coming out from the extruder. We can verify not to find us in this situation through a simple test, to pull with little force the filament away from the extruder, a filament, also not healthy but united will not move, while a broken filament will come out without the least effort.
Interruption of printing: Filed off Filament
The next test is to open the part of the extruder that contains the motor pulley, the wire pusher, extract the wire (remember to preheat the extruder), and analyze the same.
If the filament, in the part in contact with the wire pusher, is damaged or even abraded, then we can refer to the article that explains how to remedy the abrasion of the filament.
Interruption of printing: Clogged nozzle
The most common cause of interruption of the filament output during a print job is nozzle clogging. In this article we explain what causes it, how to proceed with unblocking and some unscientific trick to prevent the problem from recurring.
Interruption of printing: Filament diameter
Even the filament can “put its own” and increase our difficulties. Many filaments, more often those of very low quality, do not have a constant diameter. In simple terms, it means that they are fatter in some specific places. This variation in shape, if very accentuated, can precisely block the flow of the wire inside the extruder. Unfortunately, here we can not remedy if we do not measure with a digital caliper sample of our filament and, incase we find large differences in measurement, extract the wire and put it in the appropriate container of the differentiated.
Interruption of printing: Motor settings
The extruder motor must work incessantly during a print job. It can be put under pressure by making a considerable effort to push the filament or by going back and forth very quickly. This is the case for prints that require a lot of retraction.
This hard work requires a great deal of energy, as we know the passage of energy generates heat. If the motor driver, placed on the motherboard does not have enough cooling it can happen that it overheats and stops working. It happens more frequently when for various reasons it has been necessary to push the motors more with the Vref regulation. Don’t worry, if the phenomenon happens only once, or very rarely we can not even give it weight, but if the episodes become more frequent or we want to have an efficient printer in all conditions we can add a cooling fan, maybe that points directly to the driver incriminated.
Interruption of printing: Electronic problems
If all the above checks prove to be unsuccessful, then we must focus our attention on the electronics. It can happen that a defective mosfet can allow the extruder to heat up but inhibit the maintenance of the temperature throughout the print. This does not always cause the heating timeout error to form. We can say that we are in the presence of a defective mosfet when we see our printer moving to print. But without emitting filament for a total of layers. In this case we will notice in the display of the printer that the temperature of the nozzle is that of the environment. In this case we can, if we are skilled in electronics, replace the damaged mosfet, or change the board with a new and fully functional one.