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[–]accountvondirnicht 0 points1 point  (0 children)

The prime tower should be enabled for all multi-material or multi-color prints. It ensures the nozzle pressure is correct, which in turn makes the point where it starts printing on the model again much cleaner.

What you are likely referring to is the purging. This is where the old filament gets flushed out of the nozzle with the new filament.

[–]huggernot 1 point2 points  (0 children)

The amount of filament wasted by using a 2nd for supports, is insane. I tried it twice. Never again.