Ultimaker 2 Extended User Manual page 26

4. Remove the new filament
• Lower the temperature to 90 degrees (for PLA) or 110 degrees (for ABS)
• Once the temperature has been reached, pull the filament out with a quick, firm pull
• Check the color and shape of the tip of the filament; the goal is to have a clean, cone-shaped tip
• Repeat step 3 and 4 until the filament comes out without any residue and has a cone-like shape
5. Re-assembly
• Insert the bowden tube through the tube coupling collet all the way down into the PTFE coupler
• Place the clamp clip around the tube coupling collet so that it secures the bowden tube
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