1Zpresso K-Ultra: Grind Settings for Every Brew Method

0.7.8 on a 1Zpresso K-Ultra for a V60 with a light roast. 0.7.1 for an AeroPress with a medium roast. 1.0.0 for a French Press. Concrete numbers are more useful than any "medium-fine" label you'll find online.

The K-Ultra is the all-round grinder in 1Zpresso's K series. Heptagonal burrs with the "K Burr" geometry, 100 clicks per turn of the dial, and the fine resolution that makes it a pour-over favorite. 1Zpresso markets it for every method: filter (V60, AeroPress, Chemex, French Press) and espresso too. In practice, it's most at home on filter, where the heptagonal burrs and fine dial pay off most.

This guide gives you the setting for every brew method, organized by roast level. These are starting points. Every coffee is different, so you'll want to adjust based on the profile. But a concrete range is always better than a vague description.

If you have a different hand grinder, we also have dedicated guides for the Comandante C40 (the premium filter reference), the 1Zpresso JX-Pro (40 clicks per turn, the all-round sibling with an espresso focus), and the 1Zpresso ZP6 (the other filter sibling, with hexagonal burrs and even more focus on clarity).

How to Read a Setting

The K-Ultra dial is written as Rotation.Number.Click (R.N.C):

• 10 clicks per number, 10 numbers per turn = 100 clicks per full turn.
• 0.8.1 means 0 full turns from zero, number 8, click 1. You read the number off the dial, then count clicks.
• Fewer clicks = finer grind. More clicks = coarser grind.

To find zero: tighten the dial until the burrs touch and the handle gives resistance. That's 0.0.0. Count up from there.

Quick Reference Table

Starting points are for a washed coffee with a medium roast. For light roasts, go ~3 clicks finer. For dark roasts, ~3 clicks coarser (on Chemex and espresso the jumps grow to 6-7 clicks and on French Press the 1.0.0 ceiling never moves; each section gives the exact value).

V60

This is where the K-Ultra does its best work. Its fine resolution lets you find the exact sweet spot for each coffee, something a coarser-stepped grinder can't offer.

• Light roast: 0.7.8.
• Medium roast: 0.8.1.
• Dark roast: 0.8.4.

Target brew time: 2:30 to 3:30 for a 15g dose with 250ml water. If it drains too fast and tastes sour, go 3–5 clicks finer. If it stalls and tastes bitter, go coarser.

AeroPress

The AeroPress is forgiving on grind, so it's a good way to try new coffees without overthinking the setting. It runs a touch finer than V60. Go finer still for short, punchy steeps.

• Light roast: 0.6.8.
• Medium roast: 0.7.1.
• Dark roast: 0.7.4.
• Fine grind, short steep: drop to around 0.6.0 for more body, closer to espresso character.

Chemex

The Chemex filter is thicker than a V60 filter, so it absorbs more oils and slows the brew down. You need to grind a bit coarser to compensate: on the K-Ultra that's near the top of the dial.

• Light roast: 0.9.1.
• Medium roast: 0.9.7.
• Dark roast: 1.0.0.

Target brew time: 3:30 to 4:30 for a 30g dose with 500ml water. If the drawdown takes more than 5 minutes, go a few clicks coarser (1.0.0 is the ceiling).

French Press

Coarse grind. The metal mesh lets fine particles through, and those keep extracting while you drink. On the K-Ultra, French Press sits right at the top of its range.

• All roasts: 1.0.0.

The K-Ultra is a pour-over grinder: 1.0.0 (one full turn) is its coarsest brewing setting and exactly where 1Zpresso places French Press. It's a medium-coarse French Press rather than a very coarse one, which suits the clean cup the K-Ultra is built for. For a chunkier French-press or cold-brew grind, a dedicated coarse grinder will go further.

Espresso

1Zpresso markets the K-Ultra as all-round, and it technically covers the espresso range (about 0.2.6–0.5.6). But the K Burr geometry is tuned for filter extractions, not for the pressure of espresso. The resolution is fine enough for small adjustments. Even so, some prefer dedicated espresso grinders to maximize control in that narrow range, like the J-Max or the J-Ultra.

If you pull the occasional shot at home, the K-Ultra holds up well. If espresso is your main method, look at the J-Ultra or J-Max from the same brand.

• Range: 0.2.6 – 0.5.6.
• Light roast: 0.3.0 (finer, for more extraction).
• Medium roast: 0.3.3.
• Dark roast: 0.4.0.
• Adjust 1–2 clicks at a time so you don't overshoot your shot time.

Moka Pot

• Range: 0.6.3 – 0.7.5.
• Light roast: 0.6.6.
• Medium roast: 0.6.9.
• Dark roast: 0.7.2.

Start at the starting point and adjust from there. If the brew sputters and hisses, it's too fine. If it comes out pale and watery, it's too coarse.

How Roast Level Changes Your Setting

Same grinder, same method, same dose, and yet a light roast and a dark roast can be several clicks apart on the K-Ultra. Light roasts are denser and harder, so the water needs more time and surface area to extract the sugars, and that's why you grind finer. Dark roasts are softer and more soluble, they give up their flavors faster, and you grind coarser to avoid harsh, ashy notes.

The simple rule for the K-Ultra: medium roast = base setting. Light = roughly 3 clicks finer. Dark = roughly 3 clicks coarser. On Chemex and espresso the curve flattens and the jumps grow to 6-7 clicks; on French Press the 1.0.0 ceiling never moves. Use the exact values from each section.

For espresso the pattern stretches toward the dark side: medium to dark is 7 clicks (0.3.3 → 0.4.0), versus the usual 3 for light (0.3.0 vs 0.3.3).

How to Dial In

The table gives you a starting point. Here's how to find your ideal grind from there:

1. Pick the starting point for your method and roast level.
2. Brew and taste. Brew time is a clue, but taste is what matters.
3. Adjust 3 clicks at a time. Sour and thin? Go finer. Bitter and heavy? Go coarser. With the K-Ultra's resolution, 1 click changes little; 3 starts to show.
4. Change one thing at a time. Don't adjust grind and dose at the same time.
5. Write it down. Or use Coffee Master to log your brews automatically.

Most coffees land within a few clicks of the starting point on the K-Ultra. If you're way off, check your water temperature or dose before going further.

Maintenance

The K-Ultra is built to last, but the burrs need a quick clean now and then.

Weekly (if you grind daily): unscrew the top chamber, take out the inner burr, and brush everything with a dry natural-bristle brush. A clean paintbrush works great. Monthly if you use it less often.

A few things to keep in mind:

• No water on the burrs. Brush only. The K-Ultra's steel is durable, but moisture accelerates wear.
• The adjustment dial doesn't need maintenance. It's sealed.
• On your first clean you might find leftover residue from factory break-in. That's normal.
• A light tap on your palm after grinding shakes out any grounds stuck inside. K-Ultra retention is very low thanks to the heptagonal burrs.
• New burrs need a break-in period. The first 300–500g may grind a bit unevenly while the edges polish themselves. Use whatever beans you have on hand.

Common Issues