How to Dial In Espresso With the Bottomless 2-in-1 Portafilter

Brewing Espresso at home can be a great way to expand your at-home coffee experience. Unlike drip coffee or a French press, however, espresso is a more precise, high-pressure brewing method where small changes in grind, dose, and timing make a big difference in the cup. Manual espresso machines like Flair's lever-operated brewers let you control every part of the process by hand, without the cost or complexity of an electric machine. Whether you're brand new to espresso or just moving past pre-ground coffee for the first time, understanding how "dialing in" works is the key skill that unlocks better shots.

The black, Bottomless 2-in-1 portafilter, included as standard on the Flair Classic, and the Flair 2GO, and it's where manual espresso really starts to feel like a craft rather than a routine. If you've already brewed a few shots with pre-ground coffee using the flow-control portafilter, the bottomless 2-in-1 portafilter is the natural next step.

There's a catch: this portafilter doesn't work with pre-ground coffee. To get a proper shot, you need to dial in, or adjust your grind and dose, so you draw out the best from your coffee. This guide walks through exactly how to do that, using the same process shown in our video demo.

What You'll Need

Before you start dialing in, gather these tools:

• An espresso-capable burr grinder. This means two things: it's a burr grinder (not a blade grinder), and it has enough grind settings to make small, precise adjustments. A grinder with more settings gives you finer control. The Flair Royal Grinder, for example, offers 72 settings in 0.02mm increments for around $150.

• A scale, ideally with a built-in timer. You'll use this to measure your dose, your extraction yield, and how long the shot takes to pull. This is where a dedicated espresso scale like the Flair Brew Scale comes in handy.

• A dosing funnel and tamper. Both come standard with the Flair Classic and the Flair 2GO.

What Makes the Bottomless 2-in-1 Portafilter Different

The bottomless 2-in-1 portafilter holds roughly 12g of dark roast or up to 16g of light roast coffee. It includes a removable spout, so you can choose to brew with full visibility of your portafilter, or to direct your espresso cleanly into your cup.

Two design details make it especially beginner-friendly:

• Smaller diameter - Unlike the 58mm industry standard, this portafilter is narrower, which forgives small inconsistencies in technique.

• Extra depth - The portafilter is also taller or deeper than commercial alternatives, so if your puck prep isn't perfect, the added depth reduces the impact on your shot, improving consistency and easing the dial-in process.

Together, these features let new users experiment with real espresso brewing without getting lost in advanced variables right away.

The Target: A 20 to 25 Second Extraction

When dialing in with this portafilter, you're aiming for two things at once:

1. An extraction time of 20 to 25 seconds

2. Brewing within the "espresso zone" on your pressure gauge

To hit that window, you'll adjust one variable at a time. Here we cover adjustments to grind size. Everything else stays constant while you fine-tune the grind, including dose, yield, and technique.

The Standard Ratio to Aim For

A common starting ratio in espresso is 1:2. This means your brewed espresso should weigh about twice your dry coffee bean weight. For example, a 14g dose should yield roughly 28g of espresso. This ratio isn't a strict rule, but it's a reliable starting point while you're learning to taste and adjust.

Step-by-Step: How to Dial In Your Shot

1. Set a baseline grind. Start in the middle of your grinder's espresso range. Not too fine, not too coarse.

2. Dose your coffee. When brewing light and medium roasts, we prefer to work with 14g of coffee.

3. Run a pinch test. The grounds should feel slightly smaller than table salt. If they clump toward the center but fall away at the edges, you're in a good range. No clumping at all means it's too coarse; heavy clumping means it's too fine.

4. Preheat your brew cylinder with boiled water while you prep the portafilter.

5. Load the portafilter. Add the dosing funnel, pour in your coffee, and tap gently so the grounds settle evenly across the top.

6. Tamp with light, even pressure. Just enough to compress the grounds until you feel slight resistance pushing back. A small twist at the end smooths the surface.

7. Assemble and brew. Add the dispersion screen, attach the portafilter to the brew base, place the preheated cylinder on top, fill with hot water to the fill line, insert the stem and gauge, and pull your shot.

8. Time it and taste it. This is the step people skip, and it's the key to getting exceptional results

Reading Your Shot: What the Numbers and Taste Are Telling You

Here's how the demo shots actually played out, and what each result meant:

Notice the pattern: too fast and sour usually means under-extracted; too slow and bitter usually means over-extracted. Splitting the difference between an obviously-too-coarse and obviously-too-fine setting is often the fastest way to land in the right zone.

Tip 1: Brew by Taste, Not Just by the Clock

Hitting the 20–25 second window doesn't guarantee a great shot, and missing it doesn't guarantee a bad one. Taste should always be the most important factor in determining your next steps.

• Tastes sour? The shot is under-extracted. Grind finer.

• Tastes bitter? The shot is over-extracted. Grind coarser.

• Falls outside 20–25 seconds but tastes great? That's fine. Different beans behave differently, and the timing window is a guideline, not a rule. The only real benchmark is whether you enjoy what's in the cup.

Tip 2: Roast Level Changes How You Dial In

Your starting grind setting should shift based on roast level:

• Darker roasts are less dense and more brittle. The beans shatter, producing a lot of fines during grinding. Start with a coarser grind. Larger grounds also compact less tightly, so they take up more space in the portafilter.

• Lighter roasts are more dense, and much harder. The beans do not produce as many fines when ground, and are generally harder to extract tasty flavors from. start with a finer grind to help draw out all the delicious flavor. Finer grounds compact more tightly and take up less room.

If you're switching between roasts, expect to re-dial your grind rather than reusing your last setting.

Tip 3: Grind Size Is Just One of Several Variables

This guide intentionally isolates grind size to keep the process simple for beginners. But grind size isn't the only lever you can pull. Dose size, water temperature, and brew pressure can all be adjusted to fine-tune a shot. These are all topics worth exploring once you're comfortable with the basics covered here.

Frequently Asked Questions

What's the difference between the flow control portafilter and the bottomless 2-in-1 portafilter?

The flow control portafilter works with pre-ground, store-bought coffee and is a good starting point for beginners. The bottomless 2-in-1 portafilter requires freshly ground coffee and dialing in, offering more control and a more advanced brewing experience.

How long should an espresso shot take to pull?

With the bottomless 2-in-1 portafilter, aim for a 20–25 second extraction. That said, taste matters more than the exact time and a shot outside that window can still be excellent.

Why does my espresso taste sour?

A sour taste usually signals under-extraction. Try grinding finer to slow the extraction and pull more flavor from the grounds.

Why does my espresso taste bitter?

Bitterness usually signals over-extraction. Try grinding coarser to speed up the extraction and reduce bitter compounds.

Do I need a different grind setting for light vs. dark roast?

Yes. Light roasts generally need a finer grind while dark roasts generally shine with a coarser grind. Roast level also affects how much the grounds compact inside the portafilter.

What ratio of coffee to espresso should I use?

A standard starting ratio is 1:2. For example, 14g of coffee in, 28g of espresso out. Adjust from there based on taste.

Final Thoughts

Dialing in with the bottomless 2-in-1 portafilter is really about building a feedback loop: adjust the grind, pull a shot, taste it, adjust again. Once you've got a feel for how grind size affects extraction time and flavor, you'll have the foundation to start experimenting with other variables like dose and water temperature.

Have questions about dialing in your own setup? Reach out to Flair's customer service team. We're happy to help you troubleshoot.