Instructions
Ultimaker 2+ Connect user manual 33
Cold pull
1. In the Set nozzle temperature menu, use the controls to lower the nozzle temperature to 135 ºC for cleaning
lament, or 90 ºC for PLA
2. Continue to apply some pressure on the material in the print head with pliers
3. When the nozzle has reached the target temperature, use the pliers to pull out the lament
with a quick, rm pull
4. Inspect the tip of the lament. If it has a clean, cone-shaped tip like the image below, the nozzle was
successfully cleaned
If the tip of the material is not clean, raise the temperature again and repeat the cold pull steps.
Finish the procedure
1. Lower the nozzle temperature to 0 ºC and wait for the nozzle to cool down
2. Insert the Bowden tube into the print head by pressing down on the tube coupling collet in the print head and
pushing the Bowden tube all the way in
3. Pull the Bowden tube and tube coupling collet approximately 2 mm upwards. Keep the tube coupling collet up
and push the Bowden tube further in
4. Secure the tube with the clamp clip
Check the TFM coupler
The TFM coupler (the white part in the Ultimaker 2+ Connect hot end) can deform. The coupler is a consumable
item that wears over time and slowly changes shape on the inside due to heat and pressure in the hot end.
Eventually, this will cause friction to the material that has to pass through and causes under-extrusion.
Checking the condition of the TFM coupler requires disassembling the Ultimaker 2+ Connect print
head. Instructions on how to do this and how to replace the TFM coupler when necessary are found on
the Ultimaker website.
Check the feeder
Extrusion problems can also be related to the feeder. Clean the feeder and Bowden tube according to the
maintenance instructions. Additionally, check if the feeder tension is set correctly. For all Ultimaker materials, the
tension indicator should be set to the middle mark.
Use the hex screwdriver to turn the bolt in the top of the feeder to adjust the position of the tension indicator.
If you have an Air Manager, it must be uninstalled rst in order to reach this bolt.
6.3 Adhesion issues
Adhesion problems can include the print not sticking to the build plate or warping of the material during printing.
When you experience problems with the adhesion of a print to the build plate, the following things can be done:
• Ensure that the correct adhesion method was used. See the Ultimaker website for the recommended adhesion
methods per material
• Level the build plate to ensure the distance between the nozzle and build plate is correct. Navigate to
Maintenance → Level build plate and follow the instructions on the display
• Check the Ultimaker Cura settings that were used and try printing with one of the default
Ultimaker Cura proles
The use of the Air Manager is highly recommended. It ensures a closed environment and can improve the
adhesion, especially with engineering materials.