They are really good at changing filament types for printing which can have different temperature ranges. I remove the previous filament and then feed one of them to clean the remaining filament, lower or raise the temperature, remove the cleaning filament and then feed the one I want to print with. Helps maintain excellent nozzle flow and prevents clogging. I tend to use the nozzle cleaner as well when deployed to remove any residue from the previous filament and they work well together.
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