What happens when a handheld grinder fits a big size conical burr, the same as a commercial electric one? I redesigned a 63mm conical burr and fit it into a handheld grinder, creating the CafeSing GRIZZ 63 Manual Coffee Grinder—a true performance beast.

 

1. The Charm of a Big Size Conical Burr Handheld Grinder

a. Large Burrs vs Small Burrs

Larger burrs have a longer grind path, producing more consistent coffee powder and making brewing easier. Big-size burrs can be loaded with more complex cutting patterns, offering more particle shape and size distribution variety. And more possibilities mean more fun.

b. Conical Burrs vs Flat Burrs

Different burr types are like different chefs. Conical burrs are like an American barbecue chef, bringing out good strength and rich body flavors that flat-burr or ghost-burr hard to replicate.

c. Handheld Grinder vs Desktop Manual Grinder

Desktop manual grinders can fit full-sized burrs, and handheld grinders sacrifice some burr capability, but in return, you can easily disassemble, assemble, and grind with just your hands in the small space right in front of your chest. It's portable and adaptable to any environment.

In short, the charm of a big conical burrs handheld grinder is that, even for coffee beginners, it makes brewing coffee simple and fun, no matter where you are.

 

2. Three Key Features on Conical Burrs

Conical burrs have many features, but here are the three I think are most important:

a. Burr Size

When we talk about a "Xmm conical burr," we’re referring to the diameter of the outer burr. But the more critical parameter is the inner burr's diameter and height. Larger conical burrs have thicker outer edges that don’t take part in grind; they’re just there to fit larger screws to fix the outer burr in an electric grinder.

b. Particle Size Distribution of Conical Burrs

Compared to flat burrs, conical burrs produce a more comprehensive range of particle sizes. We can break the coffee ground output from a grinder into three parts: Target-Powder, Coarse-Powder, and Fine-Powder (including extra-fine). Generally, conical burrs will have a lower proportion of Target-Powder compared to flat burrs.

For example, using medium-roast beans in pour-over, my ideal benchmark is: 50% of particles between 400-850µm (Target-Powder), 15% of finer than 400µm (Fine-Powder), and 30% of coarser than 850µm (Coarse-Powder). For filter coffee brewing, too much fine powder (over 15%) can taste bitter or woody, while excessive coarse powder (over 30%) can cause hollow or sharp sourness.

Generally, flat burrs tend to have a more uniform particle size distribution that fits into this ideal benchmark more easily. but high-quality conical burrs have capable of keeping more than 50% of particles within Target-Powder (400-850µm), making pour-over brewing easier and the taste more balanced.

c. Flavor Profile of Conical Burrs

Compared to flat burrs, conical burrs have wider particle size distribution and a more three-dimensional shape, creating a dense coffee puck that provides good resistance during espresso and filter extraction. This results in a high strength, rich body, and sweet flavor.

 

3. Solving Problems with Innovative 63mm Conical Burr

The burr is the heart of a manual grinder. My idea was to design an innovative conical burr to overcome any limitations (handheld grinder hardware constraints, user comfort, and ease of operation) while making coffee brewing simpler and tastier.

After 8 months and 5 iterations, I developed the GRIZZ-63 conical burr, featuring two key design innovations:

Design A: With four-layer cutting patterns in the 63mm burr, including Horizontal-Burr, Ghost-Burr, Line-Burr, and Fine-Grinding-Zone.

Design B: Reducing the outer burr's diameter and the outer burr's top opening diameter.

The innovative GRIZZ-63 conical burr is almost an all-around burr, which solves the following problems of usability, user-friendly, coffee-making forgiveness, and better taste and flavor:

a. Lightweight

I believe the weight should stay under 800g for handheld grinders to avoid user fatigue. By trimming unnecessary edges from the outer burr, I reduced the outer burr's diameter from 63mm to 50mm and brought the burr's weight down to around 220g. This allowed GRIZZ 63 grinder weight to hit 790g.

b. Effortless Grinding by Your Hand

Manually turning a 63mm conical burr is tough, but I didn’t want to complicate the design with gear reducers or make it a desktop type. My solution is an innovative four-layer cutting structure that shifts much of the extrusion process to cutting, and using the smaller burr opening reduces bean input. This makes grinding smooth and easy.

Effortlessly grinds medium and dark roast beans for both pour-over and espresso; Handles light roasts with moderate effort for pour-over brewing; unfortunately, grinding light roasts for espresso is tough, which is a drawback of this burr.

c. Good Efficiency

I think grind time for handheld grinders shouldn’t exceed 1 minute to avoid frustration. While larger burrs are naturally faster, GRIZZ-63 sacrifices some efficiency for effortlessness. The result is not bad: it takes about 19 seconds to grind 20g of light-roast beans for pour-over—roughly 1g/sec.

d. Make Coffee Brew Simple

For pour-over (filter coffee), the GRIZZ-63 burr delivers over 50% of target size powder (400-850µm), with fines (<400µm) under 15%, making it easy for beginners to brew a great cup. For espresso, GRIZZ-63 conical burr ensures consistent grinding with a balanced mix of fine, medium, and larger size particles, creating a dense espresso powder puck for stable extraction flow.

e. Make Coffee Taste Better

GRIZZ-63 Conical Burr has an innovative four-layer cutting design, making the coarse and fine powders within a reasonable ratio while retaining the classic conical burr features: a broad particle size distribution and dimensional particle shape. Compared to smaller-size conical burrs, 63mm conical burr offers more clear flavors. GRIZZ-63 burr brings out a smooth, balanced acidity in light roast coffee beans, and easily extracts sweetness, high intensity, and rich body from medium and dark roast beans, delivering silky-smooth textures.

 

4. A Super Grinder for Beginners and Pros

The CafeSing GRIZZ-63 Hand Grinder is a true performance beast, equipped with an innovative big 63mm conical burr. It efficiently produces high-quality coffee powder with excellent particle size distribution and good shape. Whether you're a coffee novice or a seasoned pro, this grinder makes brewing espresso and pour-over simple and enjoyable, no matter the setting. Well, free a moment, and have fun!