What do you really get out of a naked portafilter?

A naked portafilter is primarily a tool to visualize your espresso extraction. You can see, among other things, whether the espresso flows calmly and evenly from the filter basket or spurts, runs in multiple streams, or strongly pulls to one side. This allows you to quickly identify problems such as channeling and uneven tamping, but for a good espresso, the rest of your foundation must also be correct.

When you first see a beautiful espresso flowing from a naked portafilter, I perfectly understand why this filter holder is so popular. First, small drops appear under the filter basket, then they come together, and a calm, syrupy espresso stream flows towards your cup. It's beautiful to watch, but for me, the real value lies elsewhere: you suddenly see a part of the espresso extraction that largely remains hidden with a regular filter holder.

I also use this during private workshops. I regularly see an espresso that starts on one side, forms different streams, or shows small spurts. Such a naked portafilter then provides useful information, but I never just look at what happens under the filter basket. I also look at the coffee beans, the roast date, the grind, how many grams of coffee are used, how much espresso ultimately ends up in the cup, and how it is tamped.

Precisely that combination is important. A naked portafilter is not a device that automatically makes a mediocre espresso good. See it rather as a magnifying glass: it helps you look closer at a process that you must then learn to understand step by step.

Open naked portafilter hout van 58mm voor de Sage en Solis espresso-machine.

What is a naked portafilter and what do you see with it?

A naked portafilter, also known as a bottomless portafilter, is a portafilter without a bottom and the usual spout. This allows you to look directly at the bottom of the filter basket. As soon as you start the pump of your espresso machine, you can see where the first drops appear and how the espresso then develops across the filter basket.

With a calm extraction, you usually see the coffee start to appear in multiple places and then gradually come together. The exact shape doesn't have to be identical every time. More important is that you don't see violent spurts, large differences between left and right, or a continuously turbulent flow.

This visual information makes a naked portafilter interesting as a learning tool. A regular portafilter with a spout can ultimately deliver a neat stream into your cup while you see much less of what's happening in the filter basket beforehand. With an open bottom, you get more information to evaluate your preparation and extraction.

Open koffie handgreep naked portafilter zwart van 58mm voor e61 groep 4.

Why does a naked portafilter spray or flow to one side?

Small jets shooting sideways from your filter basket are one of the clearest signals a naked portafilter can show. Often, channeling plays a role. By this, we mean that the water does not flow evenly through the compressed ground coffee everywhere, but finds one or more easier routes. In these spots, a relatively large amount of water flows, while other parts of the coffee are less affected.

During workshops, I also regularly see that an espresso clearly pulls to one side. A crooked tamp can contribute to this, for example. If the layer of ground coffee is pressed differently on one side than on the other, there will be no even resistance for the water.

If you see multiple streams or a lot of sputtering, don't immediately change five things at once. First, look at how your coffee lies in the filter basket, check if you tamp straight, and evaluate your grind and dosage. Are you mainly bothered by splashing? Then you'll find more causes and solutions in my explanation of a spraying naked portafilter.

Review causes of a squirting extraction
Open espressomachine houder naked portafilter van hout 58mm voor e61 groep 3.

Look beyond your technique

You can grind and tamp very precisely and still have trouble with your espresso. That's why, when evaluating an extraction, I also always look at the coffee beans in the grinder and how long ago they were roasted.

Why fresh coffee beans are important with a naked portafilter

One of the things I frequently encounter during private workshops is that someone pays a lot of attention to their espresso machine and naked portafilter, but barely knows how old their coffee beans are. Sometimes there's only an expiry date on the bag, and the roast date is unknown. Meanwhile, they're endlessly adjusting the grinder because the espresso seems to run thinner, faster, or less beautifully.

Coffee changes after roasting. As coffee beans age, they lose aroma and carbon dioxide, among other things. You notice this, for example, in the crema and in how the coffee behaves during brewing. Old beans are not automatically the sole cause of channeling, but they can make adjusting espresso more difficult and result in a less full-bodied impression.

When I switch to a lovely fresh espresso blend during a workshop, you often see much more clearly what's possible: more body, a finer structure, and an extraction that's easier to assess.

If you truly want to understand this aspect, then Roast date and freshness – Nothing works without fresh coffeedirectly relates to it.

Understand what freshness does to espresso
Naked koffie filterhouder 54mm voor sage en solis espressomachines portafilter zwart 3.

Prepare your filter basket calmly and repeatedly

What you see during extraction is largely determined by what you did before. Grinding, distributing, and tamping straight are therefore part of the same routine.

How do you prepare the coffee before assessing extraction?

Start with freshly ground coffee and ensure the coffee grounds are as evenly distributed as possible in the portafilter basket. If you see clear clumps or significant differences in height, you can distribute them first. An espresso WDT tooluses thin needles to break up clumps and better distribute the ground coffee in the filter basket.

Next, tamp the coffee straight. The most important thing is to create a flat coffee bed and perform the action roughly the same way every time. Pressing very hard is not an end in itself. Tamping crookedly is much more important to avoid, because then the puck will be constructed differently on one side than on the other.

If you find tamping straight difficult, consider a suitable espresso tamper. Pay close attention to the size of your filter basket.

Then use the naked portafilter to check the results of this preparation. Do you see an improvement? Keep the rest consistent. This way, you'll discover much faster which change truly made a difference.

Check out the WDT tool
Naked filterdrager hout van 51mm voor de'longhi dedica espressomachine 3.

Looking becomes much more useful when you also measure

A nice flow tells you something about the distribution of the water, but not how much coffee you have used or how much espresso ultimately ends up in your cup. You need this data if you want to be able to repeat a shot later.

Why just looking at your naked portafilter isn't enough

Suppose your naked portafilter looks beautiful. The espresso comes together calmly, and you hardly see any splashing. This is useful information, but it doesn't tell you, for example, whether you used 18 grams of ground coffee and let 30, 36, or 50 grams of espresso flow into your cup.

That's why I recommend home baristas keep track of at least three things: how much ground coffee you use, how much espresso comes out, and approximately how long it takes. A ratio like 18 grams of coffee to 36 grams of espresso can be a practical starting point, but don't see it as a universal law. Ultimately, you taste whether your grind and ratio suit your coffee.

With a coffee scale with a timeryou can make this data visible. Your naked portafilter then provides the visual information.

If you want to understand how to adjust an espresso step-by-step using these measurements, I cover that in more detail in The 3 Golden Rules of Espresso.

Learn to dial in your espresso better
Open naked portafilter zwart van 58mm voor de Sage en Solis espresso-machine.

Always check your machine before cutting

Naked portafilters come in different versions. The diameter is important, but the connection to the brew group must also actually fit the brand and model of your espresso machine.

Which naked portafilter fits your espresso machine?

A naked portafilter is not a universal accessory. You'll encounter many sizes, including 51, 54, and 58 mm, but simply looking at the millimeter count is not always enough. The shape of the connection and the way the portafilter locks into the group head must also match your machine.

Therefore, I always recommend checking the exact make and model of your espresso machine to determine which version is suitable. A portafilter designed for one 58mm machine will not automatically fit every other 58mm machine.

In the collection of naked portafilters for various espresso machinesyou will find different versions for brands such as Sage, De’Longhi, Gaggia, Bezzera, and machines with an E61 group head.

If you're still barely in control of your basics, I would first invest in good measurement and learning how to adjust. If you already have a solid foundation, a naked portafilter will become a particularly useful tool to learn to observe even better.

Check out naked portafilters for your machine

Frequently Asked Questions about naked portafilters and espresso extraction

What is the difference between a naked portafilter and a bottomless portafilter?

There is practically no difference. Naked portafilter, bottomless portafilter, and naked filter holder are different names for a portafilter where the bottom is open, allowing you to see the espresso flow directly from the filter basket.

Why is my naked portafilter spraying?

Here's how to download your digital products:

Will a naked portafilter automatically make my espresso better?

No. The naked portafilter primarily shows what happens during extraction. Better espresso results from the combination of suitable and fresh coffee beans, a good grind, consistent dosing, appropriate ratio, level tamping, and focused tasting.

Do I need a WDT tool with a naked portafilter?

Not always. A WDT tool can be helpful when the ground coffee ends up clumpy or uneven in the portafilter. You use it before tamping to distribute the coffee more evenly.

Does every 58mm naked portafilter fit every 58mm espresso machine?

No, our products are free from allergens and therefore gluten-free. We only use natural ingredients and don't add any unnecessary additives.

I have another question.

Contact Geert-Jan the Barista

A naked portafilter primarily helps you see better

For me, that's the main reason to use a naked portafilter. You see much more directly what happens during your espresso extraction and thus receive feedback that a regular portafilter largely hides from you.

But always look at the whole picture. Use coffee beans whose freshness you know, grind just before making your espresso, work with a fixed dosage, distribute the ground coffee calmly, tamp straight, and measure how much espresso you brew in what time. Then the image under your naked portafilter will truly gain meaning.

During private workshops, I often see how much difference that makes. As soon as the basics are better and we work with a fresh espresso blend, it becomes much easier to recognize what a calm, full extraction is and where you can still adjust.

If you want to get a better grip on your espresso independently first, start with The 3 Golden Rules of Espresso. If you prefer to look at your own machine, grinder, beans, and working method together, you can do so during a private home barista workshop.

Learn how dosage, espresso yield, and shot time work together to help you better understand and repeat your shots.

Learn to dial in your espresso better
Dubbel filterbakje in naked portafilter tijdens espresso extractie met 9 bar druk, voorbeeld van gelijkmatige extractie voor het correct afstellen van je koffiemaler

Find the naked portafilter that fits your espresso machine

A naked portafilter gives you a direct view of what is happening during extraction. Choose a version that actually fits the brand, model, and brew group of your espresso machine and use it to gradually improve your espresso evaluation skills.

Check out naked portafilters

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Naked portafilter onder een espressomachine met zichtbare espresso-extractie in een kopje

☕ Naked portafilter: what does it tell you about your espresso extraction?

A naked portafilter is one of the most interesting tools if you want to understand what happens during an espresso extraction at home. Because there is no closed bottom and spout under the filter basket, you can directly see how the espresso emerges through the coffee.

During my private workshops, I regularly see home baristas use such a naked portafilter to assess their extraction. Sometimes the espresso flows together beautifully, but I also see multiple streams, splashes, or an extraction that clearly pulls to one side. This can provide a lot of information about what happens before and during brewing.

Yet, the view under your portafilter doesn't tell the whole story. For example, I regularly encounter coffee beans that are already quite old, while someone continues to search for a problem in the grind or tamping. With fresh coffee beans and a better-controlled espresso recipe, you often only truly see how useful a naked portafilter can be.

In this article, I will therefore not only explain what a naked portafilter is but, more importantly, what to look for, what different extraction patterns can mean, and what foundation you need to truly learn from it.

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