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
Etherea - Ethiopian YirgacheffeSCA 88Medium roast · NaturalJasmine · BergamotSyrup and body, matched to these burrs.CA$24.16 · roasted to orderWhole bean coffee, with the roast date on each bag.
Prefer regular deliveries? RoastPlan is RoastAroma’s coffee subscription. Choose your coffees and their available options, then set deliveries every 1–6 weeks.
One-time RoastAroma orders are roasted to order in Ajax, Ontario and ship 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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