Why a purge tower?

Before every color change my X1C/AMS purges the old color down the poop chute. In this case, is a purge tower required? Bambu Studio defaults to a purge tower every time. Why is that?

It’s not a purge tower, it’s a prime tower

https://wiki.bambulab.com/en/software/bambu-studio/parameter/prime-tower

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@xsynatic nailed it.

I would add, if your colour changes are per layer, you can turn it off.

If they are within a layer (2 or more in each layer) you should leave it on.

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