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The solutions to help with the extrusion instability?

To make your 3D printer print high-accuracy models,  the extruder needs to extrude the plastic stably. In different parts of the prints, there is a change in the extruded thread, which will affect the final print quality. By carefully observing the printing process, you can identify problems with extrusion instability. For example, if the printer can print a 20mm long line, but you find that the extruded wire looks rough, or if the size seems to fluctuate, you may have encountered this problem. We have excerpted and squeezed out of instability for several common reasons and described how to avoid it.

The wire is stuck or twisted together?

The first thing you need to check is your printer's supply consumable roll. You need to make sure that the consumable roll can rotate smoothly and the plastic wire can be easily pulled out of the roll. If the wire is messy, or the resistance to free rotation of the consumable roll is too large, this will affect the filament smooth extrude from the nozzle. Check whether the pouring pipe is inserted completely. You need to check if the wire can pass through the pipe smoothly and the resistance is not too high. If the resistance in the tube is too high, you need to try to clean a tube and insert the tube into the bottom of the nozzle.


If the filament is not jammed, the extruder can be easily pushed, then you need to check is the nozzle itself. Then there may be tinny debris, or other objects come into the nozzle, preventing the normal extrusion. The way to test this possibility is to manually raise the temperature a bit on the machine and manually squeeze some plastic out of the nozzle. Observe that the plastic extrusion is smooth and stable. If you find out the problem, you may need to clean the nozzle. Contact your printer supplier for the correct method of cleaning the inside of the nozzle.

The layer height is too small?

If the filament runs smoothly and the extruder is not blocked, it may be useful to check some settings in the cura section. For example, if you are trying to print a very small layer height, such as 0.05mm, then there will be only a tinny space for plastic extrusion nozzles. There is only a 0.05mm gap below the nozzle, which means that the filament may be difficult to squeeze out. Repeatedly confirmed that you used a suitable layer height for your printing. In Basic-Quality-Layer Height, if you are printing with a very small layer height, try increasing the layer height to see if the problem is solved.

Extruder mechanical failure?

If you check all the above conditions but still have problems with extrusion instability, then you may need to check your extruder to see if there are any mechanical problems. For example, many extruders use drive gears with sharp teeth that can get the filament in more flexible. And this makes it easier for the extruder before and after pull and retraction filament.
This kind of extruder can usually adjust the gear pressure on the filament. If set too big,  the drive gear will not get the filament insufficiently deep, which will affect the ability of the extruder to accurately control the position of the filament.

3D printer details cannot be printed out?

There’s a fixed-size nozzle that you can use to precisely print very fine details.
For example, many printers have a 0.4 mm diameter open orifice nozzle. This is sufficient when printing many pieces,  but you will encounter problems when printing extremely fine details that are smaller than the nozzle diameter. For example, you try to print 0.2mm thin walls with a 0.4mm nozzle. The problem is that you can't accurately get the 0.2mm of extruded filament from a 0.4mm extruder. The width of the extruded filament must always be larger or equal to the diameter of the nozzle. Therefore, when you open the "layer preview" in CURA, you will find that the software deletes the subtle features. The software tells you that you cannot print this subtle feature because of the current nozzle. if you often print subtle details, this will be a problem you often encounter. There are several options that allow you to successfully print this subtle detail. Next, we introduce one by one.

Redesign a thin-walled model?

The most obvious choice is to redesign your model to include only features that are larger than your nozzle diameter. Usually, this involves editing a 3D model in a CAD file to modify the size of the subtle features. After you increase the thickness of the subtle feature, you can re-import the model into CURA to check if your printer can print the 3D shape you created. If the feature is visible in preview mode, the printer can print the modified feature.

Install nozzle with smaller opening diameter?

Most of the time, you can't directly edit the original 3D model. For example, it can be designed by other people or downloaded from the Internet. At this moment, you need to consider the second nozzle for your printer to print subtle features. In most printers, the nozzles are detachable, which makes it easier to adjust after the purchase. For example, you can buy a 0.3mm and a 0.5mm nozzle at the same time, so there will be two options for you.

3D printer vibration and loopback texture solution?

Loopback is a wavy texture that appears on the surface of the printout because of printer vibration. Usually, you see this texture as the extruder suddenly turns, as near the sharp corners. For example, you print a 20mm square and each time the extruder prints the other side of the square, it needs to change direction. In the sudden change of direction, the inertia of the extruder will cause vibrations, which will appear on the print. Next, we will discuss the common ways of causing a loopback and explain the reasons.

Print too fast?

The most common cause of loopback textures is that you are trying to print too fast. When the printer suddenly changes direction, the rapid movement will result in more power and thus lingering vibrations. If you think your printer is printing too fast, try reducing the printing speed. In the basic - speed/temperature - print speed (mm / s) to adjust the print speed, the appropriate print speed is generally between 30-80, different models of different speeds, commonly used in 50mm / s. If vibration and loopback textures appear, try to reduce the print speed by a little.

Mechanical failure?

If other methods do not solve the problem of loopback, then you may need to check the mechanical factors that may cause excessive vibration. For example, the screws may be loose, the brackets may be damaged, and excessive vibration may result. While you are printing, look carefully at your printer and try to check where the vibration originated. By the way, rub a layer of grease on the screw to lubricate the screw. Check if the platform is loose. If loose, adjust the eccentric nut under the platform to achieve the purpose of tightening.