1Zpresso K-Series

The Battle for the Benchtop For the last several years, the 64mm burr platform has dominated the enthusiast market. It is the sweet spot of consumer tech—large enough to offer professional-grade flavor but small enough to fit under a kitchen cabinet. Today, we are looking at two titans that approach this platform from polar opposite directions. On one side, we have the Mazzer Philos, the first true single-dosing effort from a legendary Italian commercial powerhouse. On the other, the Zerno Z1, a boutique, precision-engineered darling that has captured the imagination of the espresso-obsessed world through scarcity and iterative perfection. Choosing between these two isn't just about comparing specs; it's about choosing a philosophy. One represents the scaled-up reliability of a multi-generational industry veteran, while the other offers the obsessive, granular control of a modern startup. Let’s cut through the marketing noise and see which of these machines actually earns its place on your counter. Mazzer Philos: Commercial Pedigree in a Domestic Frame The Mazzer Philos arrived with a massive weight of expectation. Mazzer is a name found in almost every high-end cafe globally, but they have historically struggled to adapt to the "single dose" workflow home baristas crave. The Philos changes that. It is a wide, beefy machine that feels like it could survive a decade of heavy use. It features a stepped adjustment dial on the back with roughly six microns per click—a satisfyingly tactile experience—though it can be converted to stepless for those who need infinite granularity. One of the most striking elements is the pre-breaker system. Mazzer uses an incredibly aggressive auger that essentially demolishes beans before they even hit the burrs. This leads to impressive speed but raises questions about heat and particle consistency. Then there is the build. While mostly metal, I found some disappointing cost-cutting measures. Lifting the faceplate reveals the Mazzer logo is held on by double-sided tape, and the knocker used to clear the chute is a simple piece of plastic. At a price point near $1,000, these details feel slightly out of place, even if the motor itself is bulletproof. Zerno Z1: The Precision Instrument If the Philos is a sledgehammer, the Zerno Z1 is a scalpel. This grinder is built around the concept of tight tolerances and user-serviceability. Velasco, the mind behind Zerno, has created a system that feels less like a kitchen appliance and more like a piece of laboratory equipment. The Z1 utilizes **blind burrs**—burrs without screw holes—which significantly increases the effective cutting surface area. This isn't just a gimmick; more surface area means a more uniform grind and less chance for beans to get caught in the hardware. Everything on the Z1 is magnetic and modular. The exit chute pops off for cleaning, the catch cup snaps into place with satisfying polarity, and the calibration is the most intuitive I've used. You simply loosen a central screw, set your zero point, and you are talking in microns. However, the Z1 is a victim of its own success. It is notoriously difficult to buy, often requiring a one-year waitlist, and in regions like Europe, duties and shipping can nearly double its price compared to the US market. The Data: Particle Size and Retention To move beyond subjective feelings, I took both grinders to a laboratory to run Malvern Panalytical Mastersizer 3000 tests. The data tells a compelling story. When comparing the SSP Multi-Purpose burrs in the Zerno to Mazzer’s I200D filter burrs, the Zerno produced a more unimodal peak with significantly fewer fines. This translates to higher clarity in the cup. Retention is another critical metric for single-dosing. Interestingly, neither grinder is truly "zero retention." My testing showed the Philos retaining about 0.65g and the Z1 retaining 0.88g of powder after intensive espresso grinding. While some might be disappointed by these numbers given the marketing, both are well under the 1-gram threshold that I consider acceptable for home use. The difference is in the exchange; the Zerno seems to trap powder in the front housing, whereas the Mazzer’s knocker clears the chute effectively but requires that extra manual step every time you grind. Sensory Analysis: Espresso and Filter Performance In my taste tests, the Zerno Z1 consistently edged out the Mazzer Philos in clarity and sweetness. Using the High Uniformity (HU) burrs in the Zerno, I achieved a thick, syrupy mouthfeel with balanced acidity that felt refined. The Mazzer’s espresso burrs (I890) produced a good cup, but the texture felt rougher and the acidity was a bit more "punchy" and less integrated. It’s a profile that might favor darker roasts, but for light-to-medium specialty beans, it lacked the elegance of the Zerno. Filter coffee told a similar tale. The Zerno, equipped with SSP Multi-Purpose blind burrs, produced a cup that made my mouth salivate with refined sugar sweetness and juicy acidity. The Mazzer was by no means bad—it reminded me of high-quality hand grinders like the 1Zpresso K-Series—but it turned "hollow" on the back end of the palate. The Zerno’s ability to maintain sweetness through a faster drawdown is a testament to the superior alignment and burr geometry. Final Recommendation: Which is the Better Buy? The Mazzer Philos is the practical choice. You can buy it today, it has a massive service network, and it is built by a company that will likely exist for the next century. It is a workhorse that looks great and performs reliably. If you want a significant upgrade from a budget grinder and don't want to play the "pre-order lottery," the Philos is a fantastic machine. However, if you are chasing the absolute ceiling of 64mm performance, the Zerno Z1 is the superior tool. Its implementation of blind burrs, superior alignment, and thoughtful user interface makes it the better sensory performer. You just have to be willing to wait for it. For those who can't wait and have a slightly higher budget, I’d actually suggest looking at the Wug2-83 or even jumping to a 98mm platform. But within the 64mm realm, the Zerno Z1 remains the king of precision.