The Ultimaker print cores have a status LED to give a visual indication of what the print core is doing.
The table below explains the different print core statuses and the LED indications:
|Blue||The print core is not in use (idle). It has cooled down completely.|
|Blue (pulsing)||The print core is awaiting user input, for example during the Change print core process.|
|Orange||The print core is hot. It has reached the requested target temperature. Do not touch the nozzle or remove the print core.|
|Orange (pulsing)||The print core is hot. It is heating up or cooling down to the requested target temperature. Do not touch the nozzle or remove the print core.|
|White||A print job is in progress. The print core is in use during a print.|
|White (pulsing)||A print job is in progress. The print core is not currently in use, but heating up or cooling down.|
It is always recommended to follow the guided procedures in the menu for loading or unloading a print core. Never remove the print core while the LED status indicates that the print core is in use or hot, as this will cause an error message.
Caution: When certain maintenance actions require interacting with a hot print core (for example, when cleaning the surface of the nozzle), never touch the nozzle with your bare hands. Protective equipment such as thermal gloves is advised.