The Opus conical burr grinder is the machine we hand to people who brew more than one way and do not want a second grinder cluttering the counter. We roast coffee for a living in Concord, and the question we field most often is not which bean to buy. It is why the same bag tastes great one morning and flat the next. Nine times out of ten the answer is the grinder.

What the Opus conical burr grinder is and who it suits

The Opus conical burr grinder is an electric machine with a stepped adjustment collar, a motor sized for the job, and a footprint that fits under a standard cabinet. It is a single dose machine, meaning you weigh in what you plan to brew rather than parking a hopper full of beans on top for a week.

It suits the household that owns a drip machine, a French press, and maybe a small espresso setup. It also suits the person who is tired of a blade chopper and wants a real step up without buying a dedicated espresso grinder and a dedicated brew grinder. If you brew exclusively pour over and never touch espresso, look at the Ode Brew Grinder Gen 2 instead. If you want something that travels, the BruTrek hand grinder is the better fit.

Grind settings on the Opus conical burr grinder and the brew methods they serve

With 41 or more precision settings and a printed grind guide on the collar, you get real resolution across the whole range. Here is how we think about those settings when we are dialing in a coffee on our own bar.

• Fine, the tight end of the range. Espresso. You are aiming for a texture close to powdered sugar. Expect to move a setting or two as a bag ages, because coffee grinds coarser as it degasses.
• Medium fine. AeroPress with a short steep, and moka pot style brewing. Enough resistance to slow the water down without stalling it.
• Medium. Pour over and electric drip. Think table salt. This is where most people live, and where a consistent burr set pays off the most.
• Medium coarse to coarse. French press and cold brew. Closer to raw sugar or coarse sea salt. Coarse grounds keep the press clean and stop cold brew from turning muddy over a long steep.

Our advice is to change one thing at a time. Lock your dose and your water, move the grind, taste. Our grind size guide lays out the visual reference points, and the perfect brew guide covers ratios for each brewer.

Specifications

• 41 or more precision settings with an intuitive grind guide
• C6-40 Burly Burrs, a 6 blade 40 mm conical burr set in stainless steel
• 6 Nm of torque
• 350 RPM burr speed
• Anti static technology
• Timed autostop
• Magnetic catch cup with a spouted catch for transfers
• Low grind retention
• 110 gram grinds capacity
• Single dose loading, with a volumetric dosing lid for measuring beans
• Dimensions, 210 mm by 129 mm by 268 mm
• Weight, 5 lb or 2.3 kg
• Cord length, 1 m
• Power, 120 VAC, 60 Hz
• Materials, ABS, PC and PP plastics with stainless steel burrs
• Compatible with Fellow standard C6-40 Burly Burrs
• Intended for espresso, pour over, electric coffee makers, French press, AeroPress and cold brew
• Warning, CA Prop 65

Why the Opus conical burr grinder changes the cup, from a roaster

A blade grinder does not grind. It smashes. Run it ten seconds and you get boulders sitting next to dust, all in the same basket. Water does not care about your intentions. It pulls sweetness and acidity out of the small particles almost immediately, then keeps pulling bitterness out of them while it is still working on the big ones. The cup you get is both under extracted and over extracted at once, and no amount of good coffee fixes it.

A burr set works differently. Two cutting surfaces at a fixed distance mean the beans are reduced until they are small enough to fall through the gap, so most of the particles land within a narrow band of each other. Uniform particles extract at roughly the same rate, which is the whole ballgame. It is the difference between a cup with a clear middle and one that tastes hollow and harsh at the same time.

Two more things a roaster notices. First, static. Fresh roasted coffee carries a charge when it is ground, and grounds that cling to the chute are grounds that do not reach your brewer, which quietly changes your ratio. Second, retention. Coffee left inside the grinder from yesterday goes into today’s cup stale. The anti static treatment and low retention design on the Opus conical burr grinder address both, which matters more when you are grinding coffee that was roasted last week rather than last spring.

Ground coffee has an enormous amount of surface area exposed to oxygen, and it stales in minutes rather than days. That is the real argument for owning a burr grinder at all. Buy whole bean coffee, grind what you are about to drink, and you have made a bigger improvement than any brewer upgrade will give you.

The other thing worth saying plainly is that torque matters. A motor that bogs down at the fine end heats the grounds and slows the whole process, and heat is not your friend when you are trying to keep aromatics in the cup. The 6 Nm of torque and 350 RPM burr speed on the Opus conical burr grinder are a low and slow combination on purpose. Slower burrs mean less heat and less noise, and enough torque behind them means the fine settings do not stall when you feed it a dense, lightly roasted bean.

Frequently Asked Questions

Can the Opus conical burr grinder really pull espresso?

Yes. It is built to cover true espresso at the fine end of its range along with everything coarser. If espresso is the only thing you brew, a dedicated espresso grinder will give you finer adjustment steps, but for a household that brews several ways, this covers the ground.

How much coffee does the Opus conical burr grinder hold?

The grinds capacity is 110 grams. It is designed for single dose loading, so you add the beans for the batch you are brewing rather than storing them in the machine. The volumetric dosing lid helps you measure without a scale, though a scale is still the more accurate way to work.

How do I know which setting to start on?

Start with the printed grind guide on the collar for your brew method, brew a cup, then adjust by taste. Sour and thin means go finer. Harsh and drying means go coarser. One or two settings at a time is plenty, and write down what works for each bag.

What is the difference between conical and flat burrs?

Conical burrs use a cone inside a ring, flat burrs use two facing rings. Both produce far more consistent grounds than a blade ever will. The practical difference shows up in particle distribution and in how each design handles the extremes of its range. The Opus conical burr grinder runs a 6 blade 40 mm conical set, which is a large part of why it stretches from espresso to cold brew in one machine. Burr mills have worked on this principle for centuries.

Can I get the Opus conical burr grinder locally?

You can. We keep it at our Concord, CA roastery alongside the rest of our coffee gear, and we are happy to talk through settings with you and grind a test dose on the spot.