For most FDM 3D printers, there is a small drive gear (feeding gear) to bite the filaments and clamp the filaments together with a bearing. The feeding gear has sharp teeth, which can bite the filament and push the filament back and forth by changing the direction of rotation. If the filament is jammed and the feeding gear still rotating, the filament will no longer be bitten by the feeding gear due to continuous grinding.
Many users describe this problem as “filaments grinded off” because the filaments are scraped off too much and the extruder cannot work properly. If your printer also has this problem, you should be able to find a lot of filament debris that has been grinded from the filaments. At the same time, you can also observe that although the extruder motor is rotating, the consumables are not fed into the extruder.
We will breakdown the solutions below to this problem.
Increase the printing temperature:
By increasing the extruder temperature to 5-10 degrees, the filament will flow out more easily.
During the printing, if the problem of filament grinding was found, click the “Print Temperature” tab on the “Home” page and set the value you want to change. Filament (like PLA or ABS) flows more easily when the temperature is higher, so this can be a helpful adjustment setting.
Printing speed too fast:
If the problem of filament grinding still exists even after increasing the extrusion temperature, the next thing you should do is to reduce the printing speed, therefore, the extrusion time of the filament becomes longer, and the extruder motor does not need to rotate so fast. The reduction in the speed of the extruder motor helps to avoid the problem of filament grinding.
Adjust the print speed from the “Home” page, then click “Print speed”, find more setting on slicing software like “internal filling speed”, “top/bottom printing speed”, “outer wall printing speed”, and “inner wall printing speed” in the advanced page. Try to reduce all these parameters by 50% to see if the grinding problem disappears.
The nozzle is tightly attached to the hot bed
If at the beginning of printing, the nozzle is too close to the building platform surface, there is not enough space for the filament to come out of the extruder, and the hole on the nozzle will easily be blocked, causing the filament grinding on the extruder. This problem is easy to find out when you see the first two layers are not extruded, that is because the nozzle is too close to the hotbed.
The solution is, try to adjust the zero point on the Z axis to make the distance between the nozzle and the hot bed suitable, and see if the grinding problem disappears.
If, all the above 3 ways you have tried, and still cannot solve the problem of filament grinding. It is probably that your nozzle is clogged. A very simple way is using a needle to get through the nuzzle. For more information user can read the clogged nozzle section for troubleshooting instructions.