Poorly aligned grinder burrs are far more common than the coffee community acknowledges.

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• Flat burr grinders tend to deposit ground coffee preferentially on one side of the portafilter, an effect worsened by higher grinder RPM. JGJonathan Gagné16 Jul 2022similar wordingAstrophysicist and coffee researcher
• Burr geometry matters more than burr size for how uniform and unimodal a grinder's output is. JGJonathan Gagné21 Sept 2023similar wording
• Brewing coffee with too deep a bed forces a coarser grind, which lowers extraction efficiency and wastes coffee grounds. SRScott Rao11 Nov 2025similar wordingCoffee consultant and author of books on espresso
• Conical burrs tend to be less unimodal and less uniform than flat burrs, though the two overlap a lot. JGJonathan Gagné21 Sept 2023similar wording
• Grinders that produce fewer fines (more unimodal) also tend to produce more uniform particle sizes. JGJonathan Gagné21 Sept 2023similar wording

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