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Clogged print core
If there is no material flowing from the print core for at least 10 minutes it could suggest that the print core got clogged
due to some dirt or carbonized material. In this case, the print core should be cleaned by performing the hot and cold pull
method.
Using the Ultimaker cleaning filament is the most effective way to clean and unclog a print core on the Ultimaker 3. If you
don’t have the Ultimaker cleaning filament at your disposal, you can use PLA. Take a look at chapter 6.11 Clean print cores
for detailed instructions.
Print core not recognized
If a print core is not recognized by the Ultimaker 3, the printer will inform you about this. The main reason for this are dirty
contact points on the chip at the back side of the print core. When this happens, clean the contact points with a cotton swab
and some alcohol.
7.2 Print core troubleshooting