xBloom Studio Grind Size Guide

The xBloom Studio has an 80-setting grinder built in, which is more range than most standalone grinders offer. That's genuinely useful, but it also raises an obvious question: where do you actually start?

Whether you're using the Studio as a standalone grinder, dialling in a Copilot recipe, or just trying to understand how the settings translate to real-world grind sizes, this guide gives you a clear reference point for every brew method and goes deeper into pour over, where the Studio does most of its best work.

How the xBloom Studio Grinder Works

The xBloom Studio grinder runs on a 1 to 80 scale. At setting 1, the burrs are producing grounds around 180 microns, which is espresso territory. At setting 80, you're up near 1050 microns, which is suitable for French press and cold brew. That works out to roughly 18 to 19 microns per step, meaning each click of adjustment makes a meaningful difference.

The grinder uses stainless steel conical burrs and allows you to adjust both grind size and RPM (revolutions per minute) independently. The grind size controls particle size and directly affects how quickly water passes through the coffee bed. RPM affects how the grind distributes, with lower speeds tending to produce more texture and complexity, while higher speeds lean toward clarity and a cleaner, sweeter profile.

When using the Studio in FreeSolo or Copilot mode, grind size is one of the most powerful variables you have control over. It's always worth adjusting grind before reaching for anything else.

xBloom Studio Grind Size Chart

The chart below maps each brew method to its recommended micron range and the corresponding xBloom Studio setting range. These are starting points, not fixed rules. Every coffee is different, and your recipe, roast level and personal preference will all influence where you end up.
The best way to approach this in my opinion is to start at the highest number setting and then adjust finer.

A few things worth noting. French press, cold brew, and cold drip all call for grinds coarser than 1050 microns in some recipes. Because the xBloom Studio caps out at roughly 1050 microns at setting 80, you're working with the coarser end of the machine's range for these methods. The Studio is primarily designed for filter and pour over brewing, so this is expected. For the vast majority of what you'll actually be brewing on the machine, the xBloom Studio grinder's range covers you quite comfortably.

If you're using the xBloom Studio as a standalone grinder for other brew methods you should checkout our Coffee Grind Size Calculator, Simply select your current coffee grinder and your brew method for the right grind size to start off from. The calculator will 

xBloom Studio Grind Size for Pour Over Coffee

Pour over is where the xBloom Studio spends most of its time, and it's where grind size makes the biggest difference to your cup.

For pour over brewing in general, a grind size between 410 and 930 microns is the usable range, which translates to roughly settings 13 to 40 on the Studio. Within that range, where you land depends on your dripper, your recipe structure, your coffee, and what you're tasting in the cup.

The V60 and Finer Pour Over Drippers

The HARIO V60 Dripper has a single large aperture at the bottom, which means water flow is controlled almost entirely by the grind and the filter paper. A finer grind slows the drawdown and increases extraction. For V60 brewing, the recommended starting range is 400 to 700 microns, which sits between settings 12 and 28 on the xBloom Studio.

This is a tighter range than general pour over because the V60 rewards precision. Start around setting 20 to 22 and adjust based on your draw-down time. A well-extracted V60 typically finishes between 2:30 and 3:30 from the start of pouring.

Flat-Bottom Drippers and the Omni Dripper

The xBloom Studio Omni Dripper uses a flat-bottom design with multiple holes, similar to a Kalita Wave. Flat-bottom drippers are generally more forgiving than a V60 because water flow is more even across the coffee bed. For the Omni Dripper, you can work comfortably across settings 18 to 38, depending on your recipe and pour structure.
xBloom make their own xBloom filter papers, these are a small sized wave filter and translate to around the 155 size.

The Basic Barista recipes shared in the Studio setup guide use settings 40, 45, and 50 for multi-pour recipes, which lean toward the coarser end. These work well because the multi-pour structure adds agitation and contact time, so a slightly coarser grind helps prevent over-extraction across a longer total brew.

How Roast Level Affects Your Starting Point

Roast level matters when choosing your grind size, and it's one of the most common reasons a recipe that works for one coffee fails for another.

Lighter roasts are denser and harder to extract. They often need a finer grind or higher water temperature to pull sweetness out without finishing sour. On the xBloom Studio, if you're brewing a light roast filter coffee and finding it thin or sharp, moving two to three settings finer is a reasonable first adjustment.

Darker roasts have more open cell structures and extract more easily. Grind too fine with a dark roast and the cup quickly becomes bitter and harsh. A coarser starting point, moving a few settings up from your usual recipe, usually helps darker roasts stay cleaner and more balanced.

Using the Pour Over Range in Practice

If you're starting a new recipe on the xBloom Studio with your own beans in Copilot mode, a setting between 30 and 45 is a practical starting point for most filter-roasted coffees. From there, taste the cup and adjust.

If the coffee finishes too quickly, tastes sour, or feels thin and lacking sweetness, grind finer by three to five settings. If the brew takes too long, tastes bitter, or feels harsh and drying, grind coarser by the same amount. Move one direction at a time and keep everything else in the recipe the same until you understand what the adjustment has done.

Brew time is a useful signal but not the whole picture. A well-extracted cup of filter coffee from the Omni Dripper will typically take between 2:30 and 3:30 total, but this varies with dose, ratio, pour structure, and agitation settings.

When to Adjust Grind Size vs Other Variables

Grind size is usually the first variable to adjust, but it's not the only one. If you're already at a grind size that produces good draw-down time but the coffee still tastes flat or underwhelming, it's worth considering water temperature, ratio, or the number and size of your pours before moving grind further.

That said, grind size has the most direct influence on extraction speed and flavour clarity of any variable in the recipe. Getting it into the right range before refining anything else saves a lot of time and wasted coffee.

The xBloom Studio's 80-setting grinder gives you enough precision to make meaningful adjustments without large, uncontrolled jumps. Small moves of two to five settings are usually enough to shift the cup noticeably, which makes dialling in a recipe more predictable than many standalone grinders.

A Note on Using the xBloom Grinder as a Standalone

In FreeSolo mode, the Studio's grinder can be used independently, allowing you to grind coffee for any method, including brewing with your own drippers outside the machine. The settings and micron ranges in the chart above apply equally in this context.

If you're grinding for a separate V60, Kalita, or other dripper, use the relevant settings range as your starting point just as you would with any other grinder. The anti-static catch cup helps keep retention low and transfer clean, which is particularly useful when grinding for an external brewer.

The xBloom Studio grinder is capable enough for most filter applications and holds its own as a standalone option if you want to use your own equipment alongside the machine.