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Maintaining the BB print core
To keep the BB print core in optimal condition it is necessary to clean it once every 250 hours of printing. This will prevent
the BB print core to get clogged because of degrading PVA material. Cleaning the BB print core will be done by doing a hot
pull and cold pull with PLA material.
Make sure there is no material in the print core when you start this procedure.
Preparing
1. Go to Material/PrintCore
g
PrintCore 2 (BB print core)
g
Set temperature and set the temperature to 230 °C.
2. Remove the clamp clip from the top of the print head.
3. Loosen the bowden tube by pressing on the tube coupling collet and pulling the bowden tube out while doing this.
4. Place the print head in the front right corner to avoid bending of the XY axles when applying pressure to the material
during a hot pull or cold pull.
Hot pull
1. Cut off approximately 30 cm of PLA with a straight cut and try to straighten the material as much as possible.
2. When the nozzle reaches the target temperature of 230 °C gently insert the piece of PLA into the print head until you
feel some resistance.
3. Hold the piece of PLA with pliers and gently apply pressure to the material for ±2 seconds so that it extrudes from the
nozzle.
The use of pliers is required to prevent injuries on your hands in case the material breaks.
Applying too much pressure to the material is almost impossible, the Ultimaker 3 will not get damaged. If
there is no extrusion, apply more pressure.
4. Pull the material out with a quick, firm pull once the 2 seconds have passed.
