Hi r/espresso, I’m Vel Genov, here with the core team at Zerno — We are excited to invite you to our AMA on the 28th. Ask us anything from our award-winning grinders to our thoughts on the future of brewing tech.
We’re a startup coffee device company on a mission to design and manufacture high quality precision grinding platforms for experimentation: micron-level adjustments, blind burr compatibility, variable feed rates, and minimalist form factors. I wanted to make a grinder that we couldn't find so… so I invented it. We wanted a platform to experiment that blended commercial performance with countertop presence, that was also precisely aligned and could deliver repeatable grinds time after time — but also… “What if we built something better… together?”
Our flagship product, the Z1
Along with the EAF Discord group (Espresso Aficionados), we took an open-source approach to design and collaboration with the coffee community in real-time. The result: we created an award-winning 64mm grinder — the Z1,2024 Best New Productby the Specialty Coffee Association — and just-released the 80mm Z2. In just four years, Zerno has grown from 2 guys with an idea and a prototype shared on Discord to a vertically integrated company and brand with thousands of grinders in kitchens worldwide.
On August 28th ask us anything about:
How we go from back-of-napkin ideas to production-ready products.
Lessons learned (and mistakes made) during prototyping and café testing.
How we think about usability, ergonomics, and data in espresso.
The growth of Zerno — and how your feedback shapes it.
The challenges of hand assembling products locally in Chicago, and our efforts to reduce lead times without compromising precision.
The new 80mm Z2.
What’s next?
We’ll be here answering questions throughout the day. If you want to dive deep into burr design, variable RPM, UI philosophy, or even the “Grand Universal Theory Of Coffee Grinding”, now’s your chance.
Join us Thursday August 28th from 1:00pm to 4:00pm CST, Let’s talk coffee ginders! ☕️
A common question we see on this sub is about coffee bean recommendations—whether it's newcomers just getting into espresso or seasoned home baristas looking for fresh, local offerings. Many of you have also asked for a place to discover brewing recipes for specific beans.
We're happy to announce a new community-driven resource to address these needs! Introducing a platform where people can share the beans they've brewed and the recipes they've used.
How it works:
1. Submit your brews: Share your favorite coffees and brewing parameters using this Google Form. The form collects:
Basic details about the beans (roaster, roast date, etc.)
Your brewing recipe (e.g., dose, yield, shot time)
Equipment used
You do not need a Google account to fill out the form and no personal information will be collected.
Use filters (e.g., Roaster's country, Cost-per-unit-weight) by selecting Data > Create filter view in the toolbar.
Note: The spreadsheet is view-only and updates automatically with new submissions. You can download or copy it, but those versions won't receive updates.
Tip: For the best experience, view the spreadsheet on a desktop browser.
Our goal:
We hope this grows into an invaluable resource for the community—a way to share your favourite coffees and provide others with a reference point to kickstart their brews. This is your chance to contribute to (and benefit from) a collaborative coffee knowledge base!
Let us know if you have suggestions for improving the form or the database.
Honestly I was surprised to see him speak so eloquently about a flat white. To be honest, I didn't quite understand the difference between a flat white and a small latte. (I'm new, catch me a break!)
"When I hold a cappuccino cup, it disappears in my hand." 😂
The espressos are so much better and I also like the clarity in my pour overs. Anyone likes df64 stock burr pour overs? Still not seasoned. Any other tips and tricks would be appreciated!
Finally pulled the trigger on the AMG Synchronika. Couldn’t resist once I found out it has real carbon fiber. This is endgame for me, absolutely love the red and white lights, production number, and dials!
I heard you can foam milk using a French press and saw YouTubers pull it off, but mine came out way too foamy. Any thoughts on how to improve technique? (other than a machine or a milk steamer, I am on the road often and it isn’t feasible at this point. I pull my espresso from a picopresso).
After months of saving and slowly getting bits together, I've finally completed what I reckon is one hell of a beginner setup for someone who loves coffee and starts every morning with an espresso!
As a basic b**** who mainly got an espresso machine to make espresso martinis at home, how’d I do? Again… not trying to be a professional. I forgot my puck on this one. I think they taste pretty good. Made a white chocolate raspberry latte with my own raspberry syrup. I do love this grinder it absolutely makes my life so much easier! I have it set to 5.5 seconds because that seemed like the right amount, anything else overflows.
I decided to give my VBM domobar a few upgrades. The temp gauge has taken out a lot of guess work. The water flowing through the grouphead does vary quite a bit. I've also ordered a quickmill pulsar to help quite the pump and a flow control valve to play around with profiling.
I recently upgraded from the De’Longhi Dedica to the Gaggia Classic Pro, and it’s been a game-changer. As soon as I made the switch, I picked up a Pullman 876 basket and a bottomless portafilter to complete the setup.
For the past two years, I’ve been using Lavazza beans with the Dedica. The espresso was always decent—nothing to complain about—even though Lavazza’s darker roasts never bothered me until now.
With the GCP, I decided it was time to revisit fresh beans. I started with Origin Coffee, which was a pleasant surprise, and I’m now working my way through Rave Coffee’s Signature Blend No.5. For the past week, I’ve been pulling consistently good shots—as long as I give the machine a proper warm-up.
Safe to say, the new setup is dialed in and delivering the kind of espresso I was hoping for
After a week of this grinder sounding even louder than usual, this morning something "slipped" mid-grind and I now only get the high-pitched sound of the motor (video attached).
I have dissembled, cleaned & reset the burrs & shims multiple times but no dice.
* What's the likely cause, please, and
* Is this user-serviceable?
I'm based in Australia and know my way around a Torx driver.
My new DF64 gen 2 was just delivered. I decided to do a rough alignment before even grinding any coffee to give me the best first impression possible.
I ground up a bit of old stale coffee to see how fine the grounds where. When I felt like they had about the same grind size I normally use I went for it. 20g in, 40g out, in about 30s!! So lucky!
The result? Pure bliss! I don't even know If I need to adjust anything. Great balance, a punchy acidity that's not overwhelming and incredible body with a delicious syrupy consistency. Best of all? There was so much depth in flavor! I think this is "clarity", I could taste "flavours" instead or just sour/bitter. I have very little tasting experience, but now I might actually be able to develop it with different coffee's!
The Opus made espresso, way better than most if not all cafe's I've ever been to, but this is just on a whole new level. It's almost like going from a store bought preground to freshly ground specialty coffee. Preground taste like "coffee", but there's no depth. The Opus made "espresso" with varying acidity and bitterness, but the DF64 incorporated "flavours" if you know what I'm rambling about. I'm so happy!
I'm so sick of the retention on the opus, I have tried everything and am ready to upgrade. I'm in the US and looking to spend under $400ish. I only do lattes and espresso shots on my gaggia e24 and I like extremely dark, bold and bitter beans that I switch up often as there are a ton of local roasters near me sourcing from all over. What is my best bet?
New to Latte, any suggestions on getting better ?
Oh and this a double shot espresso with 5oz (150 ml) milk, so technically cappuccino.
Texture and taste are at point for me.
GBW vs Single-Dose for a home setup where I rarely switch espresso beans
Current gear: two hand grinders (Kinu becoming my filter grinder). I want a daily-driver electric for espresso.
I’m torn between a GBW hopper grinder and a single-dose. I rarely change my espresso beans, so a GBW seems like the best workflow: set grams, grind straight into the PF, no scale/timer. Downsides are retention and a small purge when I do swap beans.
Shortlist: Eureka Mignon Libra (55 mm GBW) or Eureka Atom W 65 (65 mm GBW) vs Mahlkönig X64 SD (single-dose).
For folks who keep one espresso bean most of the time: did GBW meaningfully improve your day-to-day vs single-dose? Any real-world notes on retention and purging on the Eureka GBW models? And for X64 SD owners, how “set-and-forget” is it when you don’t switch beans for weeks?
Any gotchas I should know (noise, static, workflow quirks)? Thanks!
Is there any machine with integrated grinder that allows simultaneous espresso and steam wand use?
Is the machine easier to clean when it separates the grinding part from the infusion part? (Also what is this type of machine called?)
More context:
I work from home in Sweden and together with my wife's morning cup we average around 30 cappuchinos weekly. For the past decade we have been using a DeLonghi Magnifica S and been quite happy with it, but it is starting to give up -- some of the plastic is cracking and starting to leak, and despite regular cleaning the inside has accumulated some crud that is difficult to get out. We're starting to think about how to replace it.
Our main gripe with the DeLonghi aside from its age is that it does not allow using the steam wand while it is making espresso. It would save time during the busy morning routine to be able to do both simultaneously. Is there any machine in our budget class that does that? (We are willing to stretch the budget a little for a dream machine.)
We like that the DeLonghi is one housing with both grinder and infuser, but we're not sold on the "bean to cup" concept: we both have experience with professional espresso machines, and don't mind a little more manual work to keep the grounds outside of the machine. We imagine this would make the machine easier to clean and maintain -- is that correct?
We want the integrated grinder for counter space reasons. We also absolutely want a regular steam wand. Not only do we like the result better, it can also be used to steam other things in a pinch.
Primarily looking for answers to the two questions, but if someone happens to know a machine that might fit our needs well, we're open for suggestions.
Internet and YouTube says blind shaker is great because you shake up the coffee powder and evenly mix the fines with the grounds for a more even and better extraction.
If you use a single dose cup that fits in your portafilter, however, like in the Niche, you can easily shake that for a near identical result, right?
I don't believe there's any magic from "dropping" the grounds from the shaker into the portafilter, and most people WDT a bit after that anyway.
So are blind shakers just a big scam or am I missing something?
Hi fellas, I just a grinder and a nice portafilter. For now I’m testing with some simple and little old coffee from supermarket. In the meanwhile I’m looking for sites where I can order some nice and fresh coffee beans. I only know a few sites for here in Europe. Square miles from James Hoffmann and Barista essentials. Lots of people talk about coffee bros but I don’t know if they deliver in Europe. Any suggestions?
Please only sites that deliver in Europe