The 1Zpresso K-Ultra is one of the top dogs among manual coffee grinders. On this site, it’s had the title as my hand grinder of choice for several years in a row.
Those days may be coming to an end.
I first shared my thoughts on it in a YouTube review, years ago. Since then it’s popped up in several roundups here on the blog.
Now I’ve used it for more than three years. I know its strengths. But I also know its flaws a lot more intimately than I did back then.
So it’s about time for a proper deep dive, and a look at where it stands after all this time.
Still the best user experience in a hand grinder, but no longer the automatic pick.
Fast, versatile and a joy to adjust. Excellent for pour over and solid for espresso.
After three years, the faux leather and the handle show their weak spots, and cheaper rivals have closed the gap.
Pros
- Best user experience: External adjustment, magnetic catch cup and tool-less disassembly
- True all-rounder: Switches from espresso to pour over within a single rotation
- Excellent pour over: Dynamic, sweet, and interesting
- Fast: A 15 g pour over dose in under 30 seconds
Cons
- Faux leather ages poorly: The grip zone looks scuffed after two to three years
- Handle knob: A known weak point that still hasn’t been addressed
- Loud branding: The logo on the grip zone is hard to miss
- Pricier than rivals: Cheaper grinders now come close
The K-volution
When the K-Ultra came out, it was the third generation in 1Zpresso’s K-series. At first glance it basically just looked like a slightly curvier version of the previous models, but with a crooked handle instead of the straight one that was standard until then.
My first reaction was that it’s probably old wine in new bottles. I didn’t think it was worth a closer look, since I had already reviewed the K-Max and liked it a lot.
I suspected the Ultra was mainly launched, so 1Zpresso could keep selling in Europe.
At that time, there were some legal battles going on in Europe. A German grinder manufacturer was trying to stop 1Zpresso (and several other companies) from selling in the EU, and a big part of that legal case was apparently the shape of the handle. In that regard, a foldable handle looked to me like a workaround rather than an upgrade.
To this day, I’m still a bit unsure about the concrete details. Neither company has ever disclosed anything official, but other vendors, who wish to be anonymous, have confirmed the situation to me.
Anyway, 1Zpresso was able to start selling on Amazon in Europe shortly after the design-change, so whatever they did, it seems to have worked.
My 3-year old YouTube review here
Design
The K-Ultra weighs 700 g, and to me that’s the perfect weight. The size is good too: not too big, not too small. It doesn’t feel flimsy.
The crank handle has a nice bend and curve, and it transfers the force in an efficient way. It’s a fast grinder, which also means it requires some torque. But it feels like the handle and the bearings put all that force into grinding the beans.
That makes it one of the faster grinders in my collection, both for pour over and espresso. A 15 g pour over dose takes me 23 to 28 seconds.
When you use the grinder, the first thing that comes to mind is just how well it fits in your hand. Since both the adjustment dial and the magnetic catch cup are noticeably wider than the grip zone, the grinder sort of nestles into your palm in a very satisfying way.
The K-Ultra is actually slimmer than many of its competitors, which makes it very comfortable to use even if you don’t have particularly large hands.
The handle folds flat against the body, and you twist it back into place when you want to grind. In theory, it’s a good idea. But does it really fix a problem? Does it stop the grinder tipping over? Not really. Give it a little push and it still tilts over. I guess the balance is a little bit better than it was with the old handle, but the downside is that you have a folding mechanism that could potentially break.
Game-changing adjustment
The adjustment ring is a pleasure to use. It’s very intuitive, and probably 1Zpresso’s best contribution to the world of grinders. As far as I know, they were the first company to introduce this kind of external adjustment.
The numbers are clear, logical and easy to read. There are 10 numbers and 100 clicks per rotation, with 20 microns per click, so it’s very fast to go from coarse pour over to fine espresso.
In daily use, this is the real win. I grind espresso around 2.5 and pour over around 7.0-8.5. Switching between settings takes seconds. No counting clicks, no fiddling around underneath the burrs. If you use one grinder for several brew methods, it’s a big deal.
The adjustment is cleverly removed from the grip zone, so it’s very unlikely to move a setting by accident.
Magnetic catch cup
The catch cup is held on by a bunch of magnets, so there are no threads to fiddle with. And they’re strong. The cup has never fallen off while I was grinding.
Compared to earlier models, the K-Ultra also introduces a little plastic ring that covers the magnets on the body. This reduces the friction when the magnetized cup snaps into place and protects the coating.
Capacity is around 34-37 grams, depending on the roast degree (more for light roasts), which is the same spot as most other hand grinders.
People who are drawn to hand grinders typically aren’t brewing more than half a liter at a time, so the capacity is totally fine. And if there’s a rare case where you need to grind more then you can just do it in two batches. Since the grind is so fast it’s not a huge inconvenience.
Disassembly is tool-less and quite easy. Once you’ve tried it a few times, taking the grinder apart, putting it back together and finding the zero point again is also relatively easy.
| Specification | 1Zpresso K-Ultra |
|---|---|
| Weight | 700 g |
| Burrs | 48 mm heptagonal conical |
| Adjustment | External dial, 100 clicks per rotation, 20 microns per click |
| Capacity | 34–37 g |
| Handle | Foldable |
| Catch cup | Magnetic |
| My settings | 8-7 pour over, 6.5 Hario Switch, 5.5 AeroPress, 2.5 espresso |
| Espresso grind time | Around 30 to 40 seconds for a typical dose |
Aesthetics?
My unit is the dark version, somewhere between black, dark blue and dark gray. The color still looks okay after three years. There is also a silver version that looks quite attractive, although, I have seen reports from some users that a recent production run was closer to a rose gold hue rather than a metallic/silver color.
Now the downside… The 1Zpresso branding on the faux leather is one of the least desirable aspects of this, otherwise very attractive and elegant, grinder.
Brands like Timemore and Mavo have proved that you can have a body with a nice grip and minimalist branding, while still looking coherent and “on-brand” so to speak. And 1Zpresso themselves have also done it with their more recent X-Ultra model.
The faux leather itself doesn’t look bad on new units. But it doesn’t quite age gracefully neither. Which is a shame. But more about that later.
Pour Over
The burrs are 48 mm heptagonal conicals, and pour over is where they earn the K-Ultra its reputation.
The cup is interesting to sip through. There are plenty of layers and acidity, but also sweetness, and it shines with light and medium roasts. I’d call it a dynamic flavor profile. There is some “movement” and development to the flavors. On the other hand, it’s also a grinder that colors the taste notes a little bit. It’s not super analytical and transparent like its colleague, the ZP6, is. It tends to add a signature aftertaste to most beans, but it’s a very nice one.
I prefer a 1:16 ratio with the K-Ultra, but you can push the extraction if you want. It will still hold up fine at 1:17 or 1:18. It doesn’t turn muddy or hollow.
If you’re a more conventional coffee drinker who likes body and texture, you will probably love the grinder. However, it might also be overkill, and you could also get away with a cheaper grinder. But if you buy light roasts and you’re already experimenting with your brewing water, this is where the K-Ultra pays you back.
Side-by-side test 2026
I recently compared the 1Zpresso K-Ultra with two new premium grinders (Timemore S5 and Mavo Phantox Pro ) to see how it holds up against newer rivals. Blind tests are not an exact science and this kind of testing should be combined with everyday use for a deeper evaluation of grinders. Still, I was curious.
I did two blind tastings, using a setup of three Hario Switch brewers equipped with Drip Assist gadgets for minimal variation in agitation. The cups were brewed simultaneously.
Round 1: Washed Ethiopian
For this round, I brewed three cups side by side in the Hario Switch. My blind preference was the Phantox Pro first, S5 second and K-Ultra third. However, the Phantox Pro also had the highest TDS, which can skew results.
The S5 and K-Ultra were much closer to each other, both in quality and in where they sat in the flavor spectrum.
| Grinder | Main impression | Aftertaste | Blind preference |
|---|---|---|---|
| Mavo Phantox Pro | Clean, with more elegant flavor development | Linear, and subtle | First |
| Timemore S5 | Fruity acidity, with a clear upfront pop | Held the main flavor note clearly | Second, narrowly |
| 1Zpresso K-Ultra | Similar fruity acidity and upfront pop | More movement between flavors, with extra sparkle late in the finish | Third, narrowly |
The K-Ultra and S5 actually tasted surprisingly similar. The distinction was more about how the flavors progressed. The S5 felt cleaner upfront, presenting the main note more clearly. The K-Ultra seemed to move around a little more, with some extra sparkle late in the aftertaste. I would want another session before describing those differences too firmly, but that was my impression here.
Neither cup developed its flavors quite as linear and cleanly as the Phantox.
Strength differences
| Grinder | TDS |
|---|---|
| Mavo Phantox Pro | 1.31% |
| 1Zpresso K-Ultra | 1.26% |
| Timemore S5 | 1.22% |
The Phantox produced the strongest cup. That matters when interpreting its win, because differences in strength, and potentially grind size, may have influenced my preference.
I clearly preferred it in this session, but I wanted the cups closer in TDS before making a firmer judgment about the grinders. The K-Ultra’s third place also needs perspective: it was a close comparison with the S5, rather than an obvious disappointment.
Round 2: Rwanda washed coffee
The next coffee offered a different challenge. It was quite herbal, tea-like, nutty washed Rwanda Mbilima, without the same fruit-forward character of the Ethiopian. I had made the K-Ultra and S5 a bit finer for this round to match the extraction yield on all three grinders.
The cups initially tasted very similar. The Phantox was a little softer upfront, with less bite. The S5 gave a neutral, familiar presentation of the coffee, with some initial acidity and a long lingering finish. The K-Ultra started in similar territory to the S5, although it had a slightly fermented note that I did not find in the other cups.
As the coffees cooled over the next couple of minutes, my preference changed.
The fermented impression in the K-Ultra disappeared, and a smooth and velvety aftertaste emerged. It had less of the S5’s bright acidity snap, followed by a very elegant finish. It became the cup I most wanted to keep drinking. although perhaps the least analytical cup.
| Grinder | Initial impression | Development as it cooled | Overall preference |
|---|---|---|---|
| 1Zpresso K-Ultra | Similar to S5, with a slightly fermented note | Fermented note receded; A creamy, velvety and elegant finish emerged | First |
| Mavo Phantox Pro | Softer upfront, with less bite | Became more similar to S5, but retained a subtler, less abrupt finish | Second |
| Timemore S5 | Neutral and familiar, with the brightest acidity snap | Long, but slightly dry finish. A bit rough. | Third |
With 8 g coffee, 131 g water and estimated liquid retained ratio, estimated beverage mass is 113.4 g.
| Grinder | TDS | Extraction yield |
|---|---|---|
| Mavo Phantox Pro | 1.32% | 18.71% |
| 1Zpresso K-Ultra | 1.31% | 18.57% |
| Timemore S5 | 1.32% | 18.71% |
Conclusion: This test shows that it is very close in the high end hand grinder world. Subtle changes in brewing method and extraction can affect the results more than the grinder itself. On the other hand, The test also reminded me that while the K-Ultra is not the most analytical grinder, it’s very often a thoroughly enjoyable experience with an upfront acidity hit followed by a long, velvety aftertaste.
K-Ultra vs ZP6?
One of the questions I get most often, not just about the K-Ultra – but coffee in general – is whether to get this grinder or the ZP6.
I actually went through this in more depth in a YouTube video, but it comes down to two different philosophies.
The K-Ultra is the crowd pleaser. You get clarity and acidity, but also sweetness and enough body that the cup still tastes like coffee.
The ZP6 goes all-in on flavor separation and clarity. It’s very clear and analytical, but a lot of people find it tea-like, thin and short on sweetness.
That doesn’t make the ZP6 the “better” grinder just because it’s the more extreme one. It’s a bit like any hobby. The most specialized guitar or snowboard isn’t the right choice for everyone, and plenty of experienced people still prefer the all-rounder. It comes down to what you want in the cup.
If you’re generally brewing more medium roast coffees and/or a lot of naturals or fermented coffee, then I would personally recommend the K-Ultra.
Actually, the ZP6 can taste downright flat and boring with more light to medium roast coffees that have traditional flavor notes like honey, almond, caramel, whereas the K-Ultra can really shine with those.
On the other hand if you’re mostly drinking super-light washed coffee from Nordic roasters then the ZP6 does offer a more neutral and analytical window into those flavors.
However, the gap is smaller than people think. If you grind the K-Ultra a bit coarser and pour gently with less agitation, it can taste a lot like the ZP6. I’ve done blind tastings brewed that way where I couldn’t tell which cup was which. The ZP6 has more trouble doing the reverse and giving you the K-Ultra’s sweetness and body. I sometimes recommend people that they blend different grind settings from the ZP6 to get more fines that way in order to unlock some additional sweetness.
Many of my followers who got both grinders feel the same way. So I definitely don’t think it’s a controversial perspective. On the other hand, it’s quite mainstream.
Espresso
For espresso, the K Ultra is rather fast and efficient. Expect around 35 to 45 seconds for a normal dose. Since it’s so fast it does require some torque to crank.
The shots tend to be precise and elegant rather than round and syrupy, with a slightly narrower flavor bandwidth. It also leans a little toward the acidic side, as most heptagonal burrs do when used for espresso. It does well with everything from medium to darker roasts, but I wouldn’t use it for light.
I’d still take a dedicated espresso grinder like the J-Ultra over it most of the time – you just get more body and oomph here – but K-Ultra is no slouch. It’s rare to find a grinder that’s this good at both espresso and pour over, and everything in-between. That’s the K-Ultra’s real party trick; that it just works for everything.
Three Years Later
This is the part a launch review can’t tell you, and it’s why I’m less enthusiastic in 2026 than I was in 2023.
The grip zone is wrapped in a faux leather material. At around two to three years in, mine started looking a bit scuffed up. I’m not sure exactly when and how it happened.
It’s cosmetic. It doesn’t affect the coffee at all.
But it doesn’t look that pretty.
And a side-effect is also that it makes me more cautious about just throwing the grinder in a suitcase when travelling. You probably need to bring the rather bulky travel case if you want to be on the safe side.
Yes, the carry case is a nice touch, but it adds a lot of extra bulk. I’ve often ended up not using it because I find it takes up too much space in a carry on suitcase. Instead, I use a smaller protective case, such as a neoprene pencil case, or one of my smaller, sturdy electronics bags. However, maybe I should have relied on the carrying case? On the other hand, I’m not really sure I’ve been that rough
I believe 1Zpresso should have anticipated this and planned for a surface that looks crisp after several years. The grinder pretty much hasn’t undergone any significant design updates since 2022. For that reason, I think this should be the first place to take action.
Then there is the handle. The wooden knob suddenly falling off is the complaint I see most frequently online, and I have a data point of my own: a friend picked up a K-Ultra on my recommendation and the knob fell off in under a year.
To be fair, that’s one unit, and it could easily be coincidence. Most K-Ultra owners have no trouble at all. But it lines up with what some people report, which is unfortunate for a grinder at this price point.
So Have I Changed My Mind? Again?
Sort of. Not about the coffee.
It still tastes fantastic for pour over. It’s solid for espresso. The user experience is still among the best you can buy: the external adjustment, the magnetic catch cup, switching from espresso to pour over inside a single rotation.
What changed is the field around it, and the long-term durability. Those two things together are enough that I no longer hand it out as the automatic answer.
The obvious rival in 2026 is the Mavo Phantox Pro, which costs around half as much.
I’m not comfortable saying the Phantox is simply better, and I’m not comfortable saying the K-Ultra is either. They are different.
For filter, the K-Ultra beat it in several side-by-side tests I did last year. But coming back to blind testing in 2026 it seems less unanimous . And I want to put an asterisk on those tests, because side-by-side tasting has a Coca-Cola versus Pepsi problem: over a few sips you tend to pick whichever cup is more dynamic and shows more acidity. That’s not necessarily the same as which one you want to drink a whole carafe of.
And then the obvious advantage: the Phantox Pro is around half the price.
Beyond Mavo there is also a whole tier of cheaper, capable rivals that didn’t exist when the K-Ultra launched: the Kingrinder K6 and K7, the Timemore Chestnut S3 and S5. Not to mention the Millab M01 or 1Zpresso’s own ZP6!
Verdict
The K-Ultra is still a fabulous grinder and still my pick if you want one grinder that does everything well. Nothing has a better user experience.
But it’s not the automatic top-dog recommendation it was in 2023. The price is higher than most competitors, the faux leather doesn’t age gracefully, the handle has a weak point that might cause some problems down the road.
And the competition got a lot better and a lot cheaper – that’s probably the biggest reason to consider your options carefully before pressing the “buy-button”.
That being said… I would love to see my criticisms addressed next time the K-Ultra is due for an update.
And then the grinder might very well be back on the throne again.
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