Clean the Ultimaker 2+ nozzle

Cleaning the nozzle of your Ultimaker 2+ or Ultimaker 2 Extended+ can improve your printing results. When dirt or carbonized material accumulates inside the nozzle, you may have extrusion problems, or these burnt parts can show in your printed model.

You can replace the nozzle, but extrusion problems can often be resolved by cleaning the inside of the nozzle. There is a simple process for this, that does not require disassembly of the print head. You will only need to remove the Bowden tube. This is called the hot and cold pull method, or, as it was previously known, the Atomic method.

Tip: This method can be used as corrective maintenance when the nozzle is clogged. It is also recommended to perform this process as a preventive action when switching between materials that have very different printing temperatures.


To clean the nozzle, perform the following steps:

Caution: The nozzle will become hot. Do not touch the nozzle with your hands during this process and be careful while cleaning.

Preparation Cleaning Reassembly
1. Unload material Remove the material from the printer by going to Material - Change. Wait for the material to unload. After this, select Cancel instead of loading a new spool.
2. Place print head Manually place the print head in the front-right corner of the printer. This gives you easy access to the print head and prevents damage to the print head shafts.
3. Remove Bowden tube Remove the clamp clip from the print head. Push down on the white tube coupling collet and pull the Bowden tube up and out of the print head.
4. Cut some filament Cut off a length of filament, approximately 20 cm. You can use PLA for this, but other (non-flexible) materials will also work. Ultimaker also offers pre-cut cleaning filament.
5. Heat up nozzle Go to Maintenance - Advanced - Heatup nozzle to manually select the nozzle temperature. For PLA, choose 200 - 220 ºC. For ABS, cleaning filament, or other more high-temperature materials, choose 240 - 260 ºC.
UM2-Remove-clamp-clip.jpg UM2-Remove-Bowden-tube.jpg
Remove the clamp clip Pull out the Bowden tube

Note: The instructions for the original Atomic Method were contributed by Atomic Bob and 3D Verkstan.

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