What do the different light colors mean on print cores?

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.

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