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why is second extruder heated when it is not used?

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was just wondering... why is it that whenever I start a job with only extruder 1 used the heating program starts and also heats up extruder 2 (to about 170degr.)?

generally I wouldn't mind but since extruder 2 is the BB core with pva it doesn't improve the quality of the pva when it's heated unnecessary.

any one has a thought on this?

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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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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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