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Inconsistent Extrusion

The actual amount of extrusion can be different from the expected value. It could extrude more, less or inconsistent. All will cause different problems. You can identify inconsistent extrusion by watching your printer closely as it prints. If you notice the extruded line seems to vary in size or rather bumpy, then you are likely experiencing this issue.

Check the following things to solve the problem.

  • Filament is getting stuck or tangled.

The first thing you should do is to make sure the spool is able to rotate freely and that the filament is easily being unwound from the spool. If the spool has too much resistance to spin freely, or the filament becomes tangled, it will impact how evenly the filament is extruded through the nozzle. The N-series printers include a bowden tube (a small hollow tube that the filament is routed through), you should also check to make sure that the filament can easily move through this tube without too much resistance.

  • Clogged extruder.

If not the first reason, then the next thing to check is the nozzle itself. It is possible that there is some small debris or foreign plastic inside the nozzle that is preventing proper extrusion. There are several ways to solve this problem. For details, please go to Clogged Extruder.

  • Poor quality filament

One of the most common causes for inconstant extrusion is the quality of the filament that you are printing with. Low quality filament has an inconsistent filament diameter, which will cause inconsistent extrusion. Also low quality filament may have inconsistent composition over the length of the filament, which will cause different viscosity and hence cause inconsistent extrusion. Finally, low quality filament may have shorter shelf life, because many plastics have a tendency to degrade over time. Take PLA as an example. It tends to absorb moisture from the air, and over time, this will degrade the filament and cause printing problems. This is why we include a desiccant in our spool.

We always recommend to using filament supplied by us or Raise3D-Certified filament suppliers. To check the list of the filaments we offered all certified suppliers, please visit our website at

  • Over-heated extruder motor driver

The extruder motor driver could get over-heated and miss steps. If it is this case, the extruder motor will not move at all. You can turn off the printer and allow the electronics to cool down and try printing again. This may indicate some electric problems as well and you may also contact us for further help.

  • Mechanical extruder issues

If none of the above will help, the extruder may have mechanical problems. Please contact us for further assistance.