Clean the print cores

Maintenance of the BB print core should be performed once every three months. Using the Ultimaker cleaning filament is the most effective way to clean and unclog the BB print core on the Ultimaker S5. If you don’t have the Ultimaker cleaning filament at your disposal, you can use PLA instead.

Cleaning filament can be used to clean the print core on an Ultimaker S5 by applying hot and cold pulls. Hot pulls are used to get the biggest parts of degraded material out of the print core and are especially necessary when a print core is clogged. With a cold pull, the remaining small particles will be pulled out, ensuring the print core is completely clean.

✔ Tip: If necessary, you can also use this method to clean an AA print core.

Preparation

  1. Go to Preferences > Maintenance > Print head > Print core cleaning and select Start to start the cleaning procedure.
  2. Select the print core you want to clean: print core 1 or print core 2.
  3. Select the material you want to use for cleaning: Cleaning filament or PLA filament.
  4. Wait for the printer to heat up the print core and to retract the filament until its end is visible in the Bowden tube.
  5. Remove the Bowden tube from the print head. First, remove the clamp clip and then push down on the tube coupling collet while pulling the Bowden tube upwards, out of the print head. Confirm to continue.

✔ Tip: The print head will move to the front-right corner to prepare itself.

✔ Tip: If the material is not retracted there is a chance that the material has been ground down and is stuck in the feeder. In this case, remove the material manually as described here.

Remove the Bowden tube from the print head by removing the clamp clip
Press down on the tube coupling collet while pulling the Bowden tube upwards out of the print head

Hot pull

⚠Caution: Use pliers to prevent injuries to your hands in case the material breaks.

  1. Insert the filament (Ultimaker cleaning filament or PLA) into the print head until you feel some resistance.
  2. Hold the filament with pliers and gently apply pressure to the material for ±1 second so that it extrudes from the print core or until it cannot be pushed any further, and directly pull the filament out with a quick, firm pull.
  3. Cut off the tip of the filament that you have just pulled out.
  4. Check the color and the shape of the tip of the filament and compare it with the image below. The goal is to have a clean tip.
  5. Repeat this procedure until there is no more degraded material visible on the tip of the cleaning filament. The tip of the filament should look as clean as the example below.
  6. Once the tip of the filament is clean, manually flush some filament through the print core with pliers and take it out again. Confirm to continue.

Insert the filament into the print head until you feel some resistance
Directly pull out the filament with a quick, firm pull
The tip of the filament should look as clean as the example on the right

Cold pull

  1. Insert the filament (Ultimaker cleaning filament or PLA) into the print head until you feel some resistance.
  2. Hold the filament with pliers and gently apply pressure to extrude some material. Confirm to continue.
  3. Maintain pressure on the filament with the pliers for the duration of the progress bar.
  4. Release the filament and wait until the print core has cooled down.
  5. Grab the filament with pliers and pull it out with a quick, firm pull. Confirm to continue.
  6. Take a look at the tip of the filament and see if it has a clean, cone-shaped tip like the example to the right. Confirm to continue.

Hold the filament with pliers and gently apply pressure to extrude some material
Grab the filament with pliers and pull it out with a quick, firm pull
Very dirty
Quite dirty
Clean

✔ Tip: If the tip of the filament is not clean, go back to hot pull or cold pull to repeat the cleaning steps.

Reassembly

  1. Insert the Bowden tube into the print head and secure with the clamp clip. Confirm to continue.
  2. Wait for the Ultimaker S5 to finalize the cleaning procedure.

Insert the Bowden tube into the print head
Secure with the clamp clip
Index
Support