The solutions to the inconsistent extrusion in 3D printing

BySteve Lowry 2018-10-07 3403

In different parts of the 3D 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. Let's talk about how to avoid it.

extrusion instability

 

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.

 

3D print filament

 

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.

Nozzle jam

If the filament is not jammed, the extruder can be easily pushed, then you need to check is the nozzle itself.

 

nozzle jam

 

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.

 

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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.

 

Layer height

 

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’s 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.

 

Extruder mechanical failure

 

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 in sufficiently deep, which will affect the ability of the extruder to accurately control the position of the filament.

 

 

 You may also want to read:
3D printer grinding filament solution
How to deal with the 3D printer nozzle jam
Solution for stopping extrusion in the middle of 3D printing
How to solve cracking or breaking of layers during 3D printing

 

 

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