Unfortunately, yes. No matter how revered or high-quality your grinder is, it will never be able to grind beans to the exact size. The difference between a lower-end domestic grinder and an expensive coffee shop grinder is the number of smaller and larger particles per batch each produces. Premium grinders with a high-quality burr set produce relatively consistent grinds compared to grinders that use inferior burrs. No matter which burr grinder you use, it grinds the beans through a gap between the burrs, leading to relatively uniform grinds. However, blade grinders chop beans indiscriminately, leading to even more inconsistent grind sizes. Therefore, if you're using a blade grinder, we recommend you first invest in a burr grinder before considering the Kruve sifter.