Ultimaker 2 Extended User Manual page 25

ATOMIC METHOD
After a longer time of using your Ultimaker 2 Extended you might notice some signs of "under extrusion". This means
that your Ultimaker 2 Extended can't extrude enough plastic and 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 process of this simple though very effective method is described.
NOTE: It is also adviced 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.
1. Remove the filament from the Ultimaker 2 Extended.
• Go to MATERIAL > CHANGE in order to remove the filament and instead of inserting new material, select CANCEL
• Manually move the print head towards to center of the Ultimaker 2 Extended for easier access during the next
steps
2. Removing the bowden tube from the print head.
• Open the black plastic clip that is around the bowden tube and print head cable closest to the print head
• Remove the (blue or red) clamp clip
• Press down the tube coupling collet and pull the bowden tube out of the print head
3. Heat up and preparation
• Cut off approximately 20 cm of filament with a straight cut and try to straighten the filament as much as possible
• On the Ultimaker 2 Extended, go to MAINTENANCE > ADVANCED > Heatup nozzle and set it to 260 degrees
• When the temperature is reached, insert the straightened piece of filament manually all the way down to the nozzle
• Push it slightly until either the new filament comes out of the nozzle or until the filament can't be pushed any further
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