Mazzer Robur Electronic

The Mazzer Robur Electronic is a commercial espresso grinder that you'll find in busy cafes, roasteries, and the occasional home setup of someone who takes espresso very seriously (and has counter space to spare). At roughly $2,500-$3,500, it's built to grind pounds of coffee per day without breaking a sweat. If you're researching this grinder, you're probably either outfitting a coffee shop or wondering if a commercial grinder is the right move for your home bar. I'll cover both scenarios.

I've used the Robur Electronic in a commercial setting and tested it at home, so I can speak to how it performs in both environments. The short version: it's a beast of a machine that grinds beautifully, but it comes with significant trade-offs for home users.

The Burr System

The Robur uses massive 71mm conical burrs. To put that in perspective, most home conical burr grinders use 38-48mm burrs. The size difference matters because larger burrs can spin slower (lower RPM) while still grinding quickly. Lower RPM means less heat generation and less friction damage to the coffee.

Mazzer's conical burr geometry on the Robur produces a specific flavor profile that many baristas prefer: full body, rich sweetness, and a syrupy mouthfeel in espresso. Flat burr grinders tend to produce more clarity and separation of flavors. Conical burrs like the Robur's lean toward blending flavors into a cohesive, round cup.

Grind Speed

The Robur grinds at about 3.5-4 grams per second for espresso. An 18-gram dose takes roughly 4-5 seconds. For a busy cafe, that speed keeps the line moving. For a home user, it means your dose is ground before you've finished yawning.

The speed is partly a function of the burr size and partly the 550-watt motor. This motor is substantially more powerful than anything in a home grinder. It drives the burrs at approximately 420 RPM, which is deliberately slow for a grinder this size. The combination of large burrs and low RPM is what keeps heat low and grind quality high.

Electronic Dosing

The "Electronic" in the name refers to the dosing system. The Robur Electronic uses a timed dosing mechanism. You program it with grind times for a single and double shot, and it dispenses that exact duration each time you push the portafilter against the activation lever.

You get two programmable buttons (single and double) plus a manual hold-to-grind option. Setup involves weighing your output and adjusting the time until you get your target dose weight consistently. Once calibrated, the electronic dosing is reliable and fast.

The consistency of timed dosing depends on the beans. Denser, lighter roasts grind slower by weight per second than porous dark roasts. So when you switch beans, you need to recalibrate the timer. In a cafe serving one espresso blend all day, this isn't an issue. If you rotate between multiple beans at home, the recalibration gets tedious.

Build Quality and Size

The Robur is built like commercial kitchen equipment, because that's what it is. The body is die-cast aluminum. The burr carrier, adjustment system, and internal components are all machined metal. It weighs about 46 pounds, which means once you place it on your counter, it's staying there.

Dimensions

This grinder is big. It stands about 24 inches tall, 8 inches wide, and 12 inches deep. The bean hopper adds several more inches of height and holds about 3.5 pounds of coffee. For a cafe counter, it's a standard size. For a home kitchen, it dominates the counter space. If you have a dedicated coffee bar or station, it works. On a standard kitchen counter under cabinets, you'll likely have clearance issues.

The hopper is worth mentioning. At 3.5 pounds capacity, it's designed for all-day cafe use where you fill it in the morning and grind through it by closing. Home users who single-dose will want to replace the hopper with a bellows or small single-dose hopper, since beans sitting in that large hopper go stale quickly.

Grind Quality Analysis

The Robur produces excellent espresso grinds. The 71mm conical burrs create a bimodal particle distribution (two peaks of particle sizes), which is characteristic of conical burrs. This bimodal distribution is what gives conical burr espresso its thick body and creamy texture.

For traditional Italian-style espresso and milk drinks, the Robur is exceptional. Lattes and cappuccinos made with Robur-ground espresso have a rich, chocolatey sweetness that pairs beautifully with milk.

For light-roast, single-origin espresso (where you want bright acidity and distinct flavor notes), the Robur's conical burr profile is less ideal. You'll get a rounder, smoother cup that softens bright flavors. If clarity and origin distinction are what you're chasing in espresso, a flat burr grinder is a better match.

Grind Adjustment

The stepless adjustment collar is smooth but has no markings or click stops. You adjust by feel and by testing shots. The adjustment range is wide enough for espresso through drip, though the Robur's real strength is the espresso end of the spectrum.

Like most stepless commercial grinders, finding your way back to a previous setting after changing it requires practice. Some users mark preferred settings with tape or a marker.

Retention: The Big Caveat

Here's the main issue for home users: the Robur retains a significant amount of coffee. Between 3-7 grams of grounds stay trapped in the grinding chamber, chute, and burr assembly between doses.

In a busy cafe pulling shots every 30 seconds, this doesn't matter. Fresh coffee pushes through constantly. At home, where you might grind once in the morning and once in the afternoon (or not again until tomorrow), those retained grounds go stale. Your first shot of the day includes yesterday's old grounds mixed with today's fresh ones.

The single-dose workaround helps: grind your dose, then purge a gram or two of sacrificial beans to push out retained coffee. But you're wasting beans every session. Over weeks and months, the waste adds up.

Some home users modify the Robur with aftermarket low-retention chutes, sweeper mods, or bellows systems. These help but don't fully solve the problem. If low retention matters to you (and it should for home use), the Robur isn't the best choice. Modern single-dose grinders like the Eureka Oro, Niche Zero, or Lagom P64 are designed specifically to minimize retention.

For a full comparison of grinders across all categories, our best coffee grinder roundup includes both commercial and home options. And our top coffee grinder guide ranks the standout performers.

Maintenance

Commercial grinders need commercial-level maintenance. The Robur's burrs should be cleaned weekly in a cafe setting and every 2-3 weeks at home. Disassemble the burr carrier, brush out all retained coffee and oils, and reassemble.

The 71mm conical burrs last about 1,300-1,500 pounds of coffee before needing replacement. For a home user grinding 20-30 grams per day, that's literally decades of use. For a cafe grinding several pounds daily, replacement happens every 1-2 years.

Replacement burr sets cost about $80-$120 from Mazzer. Mazzer has a global parts network, so finding replacements is straightforward.

The motor is built for continuous use and requires no special maintenance. These grinders routinely last 10-20 years in commercial environments with basic care.

FAQ

Is the Mazzer Robur good for home use?

It can be, but it's not ideal for most home setups. The retention issue, large size, and loud noise make it inconvenient for daily home use. If you found one at a great price on the used market and have the counter space, it grinds beautifully. But purpose-built home grinders solve the same problems more elegantly at a lower price.

How loud is the Robur Electronic?

Louder than home grinders but moderate for a commercial machine. The 550-watt motor and large burrs produce a deep hum rather than a high-pitched whine. It's not screaming loud, but you'll hear it clearly from another room. Early morning grinding will wake up light sleepers.

Can the Robur grind for pour-over or drip?

Yes, but it's not its strength. The conical burrs and adjustment range can produce medium and coarse grinds. The particle distribution at coarser settings isn't as uniform as what filter-focused grinders produce. If you primarily brew filter coffee, get a filter-specific grinder.

Mazzer Robur vs. Mazzer Major: what's the difference?

The Major uses 83mm flat burrs instead of the Robur's 71mm conical burrs. The Major produces a cleaner, more transparent espresso profile. The Robur produces a fuller, creamier profile. Both are commercial-grade. Choose based on your flavor preference: flat for clarity, conical for body.

Who Should Buy the Mazzer Robur

The Robur is a commercial grinder, and it's best in a commercial setting. Cafes, restaurants, and offices with high espresso volume will get the most value from it. For home users, it makes sense only if you value the conical burr flavor profile, have ample space, don't mind the retention issue, and found a good deal on a used unit. For everyone else, there are home grinders that deliver 90% of the Robur's cup quality without the compromises.