The second nozzle heating up is not desirable but can have multiple reasons:
- Which Cura and firmware versions are you using? A few improvements have been made here in the last year. Cura 2.6 with firmware 3.7 doesn't do this on my machine.
- When active leveling is enabled, then the second nozzle will always be heated to melt filament that's possibly sticking out and corrupting the measurement.
I created a feature request to skip leveling the second nozzle when only printing with a single material but can't promise on this being implemented.
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Dim3nsioneer 557
Do you use the recommended settings or do you have some customization?
If you want to make sure it is not heated, remove the PVA from printcore 2 with the assistent so the printer has "no material" in printcore 2. Then the second printcore should not be heated, not even during active leveling.
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