How often should I replace the blades? 05 January 2023 23:18 We recommend replacing blades every 6 months, depending on use. Related articles The cup/blade I ordered doesn't fit my machine. Help! What ingredients can I use with the blade discs? Are all components of the Magic Bullet Kitchen Express dishwasher safe? How do I replace the rubber gasket/seal on my blade? How do I identify which machine I have?