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After longer use of your Ultimaker 2+, you might notice that it cannot extrude enough plastic anymore. This so called
under extrusion is usually shown by very thin or missing layers in a print. In most cases, it is caused by some dirt or
carbonized material in the nozzle or another hot end part through which a (partial) blockage is created. When under
extrusion appears, it is recommended to use the Atomic Method in order to clean the nozzle and other hot end parts.
Below, the steps of this method are described.
It is also advised to use the Atomic Method when switching from a material that needs a higher printing
temperature to one that uses a lower printing temperature in order to make sure any residue from the
previous filament is removed.
REMOVING THE FILAMENT
1. Go to “Material” > “Change” in order to remove the filament. Instead of inserting new material, select “Cancel”.
2. Keep the print head in the corner.
REMOVING THE BOWDEN TUBE
1. Remove the (blue or red) clamp clip.
2. Press down the tube coupling collet and pull the bowden tube out of the print head.
HEATING UP AND PREPARING
1. Go to “Maintenance” > “Advanced” > “Heatup Nozzle” and set the temperature to 260 degrees.
2. Cut off approximately 20 cm of filament with a straight cut and try to straighten the filament as much as possible.
3. When the temperature is reached, insert the straightened piece of filament manually all the way down to the nozzle.
4. Push it slightly until either the new filament comes out of the nozzle or until the filament cannot be pushed any
further.
ATOMIC METHOD
