1Zpresso K-Ultra Review 2026: Espresso and Filter

• Fine adjustment steps: Each click changes the burr gap by a very small amount, so you can move between shots without overshooting. Espresso users benefit most, because a tiny change in grind size can shift extraction noticeably. The trade-off is more clicks to travel from a filter setting to an espresso setting.
• 48mm conical burrs: A larger cutting surface generally grinds more quickly and evenly than smaller burrs at the same effort. Filter brewers benefit from a cleaner cup. The cost is a heavier, bulkier grinder than compact travel models.
• External adjustment dial: You change the setting without taking the grinder apart, so a dot or mark on the dial lets you return to your usual espresso and V60 positions. This suits households that switch brew methods through the week.
• 35g capacity: One person's espresso or a single pour-over fits comfortably. A two- or three-cup batch means refilling, which is true of most hand grinders, including the K6.
• Foldable handle and magnetic catch cup: These keep the grinder compact in a bag or drawer, and the cup stays attached while you work. The trade-off is one more moving part to keep clean.

The K-Ultra turns the handle to crush beans between a conical burr pair. A larger burr cuts more beans per turn and produces more even particles, which lowers both sour fines and bitter boulders in the cup.

The external dial moves the burr gap by tiny steps, so you can change grind size without opening the grinder. That matters for espresso, where a small change alters flow time a lot.

A manual grinder has no motor heat, so aroma is preserved, but it takes effort and time. The manual vs electric grinders guide compares.

• Static and clumps: add a spritz of water to the beans before grinding (RDT) and tap the catch cup. A WDT tool breaks up clumps in the portafilter.
• Inconsistent shots: count clicks from zero and log settings. See the dial-in guide.
• Hard to grind light roasts: brace the grinder and use a steady rhythm. A longer handle or clamp helps.
• Residue: brush the burrs regularly and avoid washing with water; the burr grinder guide explains what to look for.
• Grind size confusion: check the grind size chart.

For dial numbers per brew method and how to find true zero, see our 1Zpresso K-Ultra grind settings chart.

• Versus the Comandante C40: The Comandante C40 review shows a grinder with a long track record and a wider service reputation. The K-Ultra's finer steps make espresso easier, while the C40 suits buyers who value its established support and mainly brew filter.
• Versus the Mavo Phantox Pro: The Phantox Pro also has an external stepped dial and costs about half as much. Choose the K-Ultra for its larger capacity, dial ergonomics and build if espresso is a daily habit.
• Versus the KINGrinder K6: Both use 48mm burrs and hold about 35g, and the K6 actually has finer steps (16 vs 20 microns per click) at well under half the price. The K-Ultra's case is its external dial ergonomics, foldable handle and more refined build; buy the K6 if price matters most.

If you only want the best electric option instead, see our highest-rated burr grinders roundup.