Will using third-party parts void my warranty?

No, not automatically — the Magnuson-Moss Warranty Act makes it illegal for companies to void your warranty just for using third-party parts, unless they can prove the part caused the failure. So swapping a vacuum filter or blender blade with an off-brand won’t kill your coverage. The catch is that if that cheap part damages the machine, that specific repair won’t be covered, but your warranty for unrelated issues still stands.