Mazzer · Conical burrRobur S
A 71mm conical-burr commercial grinder built for cafes that pull hundreds of shots a day, not for a countertop that sees a dozen. Fast, cool-running, and made to hold calibration under sustained abuse.
The short version
This is a bar workhorse first and a home grinder a distant second: it grinds an 18g dose in under 3.5 seconds and keeps its cool through a rush thanks to a dual-fan system.
You accept the size, the noise, and the price of a small used car's worth of grinder to get that kind of throughput and consistency.
Why people buy it
- Grinds fast enough (about 6g/sec) to keep up with a slammed bar without heat-driven drift
- 52% lower retention than its predecessor thanks to a redesigned chamber and lower burr carrier
Why they don’t
- Overkill and oversized for home counters — 28.5 inches tall with the hopper on
The full tally
- Grinds fast enough (about 6g/sec) to keep up with a slammed bar without heat-driven drift
- 52% lower retention than its predecessor thanks to a redesigned chamber and lower burr carrier
- Stepless micrometric adjustment with a removable collar that does not lose your grind setting
- Dual-fan cooling and IoT-ready electronics give real data on daily volume and burr wear
- Overkill and oversized for home counters — 28.5 inches tall with the hopper on
- Timer-based dosing drifts when you change grind size, so you still need a scale to true it up
- No grind-by-weight option on this model, which rivals like the Mahlkonig E80S GBW now offer
What the community knows
Years of owner threads, distilled — the default recommendation in its bracket.
Bulletproof serviceability and decades-long track record cement it as the prosumer standard for espresso grinding; the community loves it for what you never have to worry about — parts, guides, rebuild support exist for machines older than most owners — not for flash or…
Reliability
shows up every morning, year after year
Parts & serviceability
parts and repairs — you are never stranded
Built to last
years before you outgrow or replace it
All 9 community measures
price-to-performance the community respects
shows up every morning, year after year
parts and repairs — you are never stranded
mods, guides, and community know-how around it
kind to first-timers
years before you outgrow or replace it
how far the cup can go, per dollar
speed and simplicity, day to day
Worth knowing before you buy — Most owners eventually reflect that the real win is never having to replace it — the margin of safety and repairability justifies the upfront cost only if you plan to keep grinding espresso for a decade.
The measurements
Scored 0–5 on the same rubric as everything on file — the words matter more than the numbers.
The measurements
0–5, one rubric- Espresso
- reference5
- Versatility
- single-purpose2
- Built to last
- heirloom5
Position in the market
Every dot is a rival, measured the same way. The gold one is this.
- Top 10% for espresso suitability
- a higher ceiling than 141 of the 154 grinders we’ve measured
- You pay for this one
- 23% of grinders this capable cost more
- Top quarter for build
- sturdier than 89% of the field, by the community’s own record
Every dot is a grinder measured on the same rubric. See the whole market
Living with it
The part spec sheets skip: counter space, upkeep, and what owners learn later.
The honest note — Owners who want dose accuracy without babysitting a scale look at Mazzer's own Kony SG or move to a grind-by-weight competitor like the Mahlkonig E80S GBW. There is not really an upgrade path beyond the Robur S within Mazzer's conical lineup short of stepping into flat-burr territory (ZM/Major) for a different cup profile.
The full spec sheet
- Class
- Premium
- Burrs
- 71mm conical
- Drive
- Electric
- Adjustment
- Stepless
- Clarity lean
- Syrup & body
- Espresso suitability
- 5/5
- Brew versatility
- 2/5
- Retention
- ~2 g
- Single dosing
- No
- Hopper
- 1600 g
- Workflow demand
- 2/5
- Maintenance
- 3/5
- Noise
- 4/5
- Build longevity
- 5/5
Before it arrives
What completes this grinder — the faded pieces can wait.
Hover any piece for its why.
- Grinder cleaning kit — Brushes and grinder tablets keep retention and stale grounds in check.
Feed it right
Week one is dial-in — and stale beans will lose it.
Coffee more than a few weeks past roast won’t extract predictably, and a new grinder gets blamed for it. These burrs pull syrup — naturals and classic medium roasts play straight into their character.
Pick your coffee — any of these dials in beautifully here:
Highland Elixir - Papua New Guinean Sigri PlantationSCA 86Medium-dark · Wahgi Valley, Western Highlands · WashedBright Citrus · Caramel SweetnessSyrup and body, matched to these burrs.CA$22.43 · roasted to order
Lavabloom - Indonesian Sumatra MandhelingMedium-dark · Mount Leuser, Sumatra · Wet Hulled (Giling Basah)Dark Earth · Bittersweet ChocolateSyrup and body, matched to these burrs.CA$19.02 · roasted to order
Wild Ember - Ethiopian Buno Dambi UddoSCA 92Medium roast · Odo Shakiso, Guji Zone, Oromia · NaturalBlueberry · MarmaladeSyrup and body, matched to these burrs.CA$26.83 · roasted to orderWhole bean, dated, ready for your burrs the week it lands.
Roasted to order, daily, in Ajax, Ontario · ships Canada-wide. We’re the roastery behind this database — measuring the machines is how we make sure the coffee gets a fair shot.
On film
How it runs on camera, from around the community.
Common questions
Is the Mazzer Robur S suitable for home use?
Only if space, budget, and noise are non-issues. It is sized and priced for high-volume commercial cafes, standing about 28.5 inches tall with the hopper attached and drawing 800 watts.
How fast does the Robur S grind?
It grinds roughly 5-6 grams per second depending on line frequency, meaning an 18g double dose lands in about 3.5 seconds.
Does the Robur S do grind-by-weight?
No. It doses on a timer, not a scale, so grind adjustments require re-checking dose weight. Mazzer's separate Kony SG line covers grind-by-weight.
Worth comparing
Mahlkönig
EK43S
The shop-counter version of coffee's most influential bulk grinder: same 98mm flat burrs and 1300W motor as the full EK43, just shorter so it fits under a cabinet. Built for cafes grinding retail bags and pour-over by the pound, and adopted by plenty of home fanatics who don't mind the footprint.
CA$3,390–5,350 · US$3,899–5,350
Kafatek
Monolith Flat (Titan SDRM)
A Seattle-machined single-dose flat burr grinder built around 75-80mm in-house Shuriken burrs. This is the boutique end-game grinder people save up for and then stop shopping.
US$2,650
Ditting
804 Lab Sweet
A Swiss single-dose lab/shop grinder built around 80mm cast-steel burrs tuned for roundness over sharpness — the burr set that put the word sweet into grinder marketing. Discontinued and replaced by the 807 Lab Sweet, but still floating around used and in cupping labs.
CA$3,800–4,300 · US$2,895–3,200
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