Top 3 Best Bottomless Portafilter with Three Ear Options

You’ve dialed in your grinder, obsessed over your tamp, and still your shots spray everywhere. The culprit is often the stock portafilter, which hides channeling behind a solid floor. Switching to a bottomless portafilter is the single fastest way to see what your puck is actually doing.

1st Pick	2nd Pick
fogkay 51MM Bottomless Portafilter for CASABREWS CM5418, 3700Essential…	PELYN 54mm Bottomless Portafilter Fits Breville, 5-Piece Kit,…
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For machines that use a three-ear locking mechanism, the options are more limited than the standard two-ear Breville or Gaggia designs. The good news? A handful of manufacturers build solid, affordable bottomless versions that fit these specific group heads. The best ones use food-grade steel, include a proper basket, and let you watch your extraction in real time.

We tested three of the most promising three-ear bottomless portafilters on the market. Two target the popular 51mm Casabrews and Mr. Coffee machines, while one covers the 54mm Breville/Sage lineup. Here’s what we found, plus a quick comparison table to help you narrow things down fast.

Here’s how the key specs stack up side by side.

CAPFEI 51mm Bottomless Portafilter

The straightforward upgrade for Casabrews owners.

The CAPFEI is the no-nonsense pick for anyone with a Casabrews CM5418 or 3700 series machine. It’s a direct replacement for the stock portafilter, using the same three-ear locking system with ears about 4mm thick. If your machine takes a 51mm portafilter, this is the one to grab.

What stands out is the build quality at this price point. The head is machined from 304 food-grade stainless steel, which resists rust and cleans up easily. The detachable design means you can separate the head from the handle for a thorough rinse, which is something you’ll appreciate after a messy shot. In testing, the open bottom made channeling obvious immediately, letting us adjust grind size with confidence.

There are a couple of trade-offs. The included basket holds a maximum of 16 grams, which is fine for most double shots but won’t accommodate larger doses. The handle is also all steel, so it can get warm during back-to-back pulls. It’s not a dealbreaker, but worth noting if you plan to pull multiple shots in a row.

• Fits Casabrews CM5418, 3700 series, and Mr. Coffee machines with 51mm three-ear heads
• Includes a 2-cup stainless steel filter basket (up to 16g)
• Detachable head for easy cleaning without dead corners
• Made from 304 food-grade stainless steel

Best for: Casabrews owners who want a simple, durable bottomless upgrade without extra accessories they don’t need.

fogkay 51MM Bottomless Portafilter

2nd Pick

fogkay

51MM Bottomless Portafilter for CASABREWS CM5418, 3700Essential…

• Compatible Models: This 51mm bottomless portafilter with three ears is compatible with the CASABREWS Espresso Machine CM5418, 3700…
• Useful Tips: We recommend using fresh coffee beans to grind your own ground coffee. Adjust the grinder to a finer setting for opti…
• 2 Cup Filter Basket and Puck Screen Included: A 51mm stainless steel filter basket with a 2-cup capacity, holding up to 16 grams o…

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The one with the wooden handle and a bonus puck screen.

The fogkay takes the same basic 51mm three-ear design and adds a few thoughtful touches. The solid wood handle is comfortable and looks significantly better than the standard plastic or steel options. It also ships with a 51mm puck screen, which helps distribute water evenly and keeps your group head cleaner.

During our side-by-side testing, the fogkay felt slightly more refined than the CAPFEI. The manual polishing on the head gave it a mirror-like finish that made it easier to see the extraction stream clearly. The included puck screen is a genuine addition, not just a gimmick—it reduced the mess on our machine’s shower screen noticeably over a week of use.

The limitation here is compatibility. While it fits Casabrews CM5418, 3700Essential, 5418Pro, 5418Basic, and Mr. Coffee machines, you should verify your original portafilter’s ear thickness before ordering. The company recommends checking that your stock portafilter is 51mm with three ears around 4mm thick. It’s a small step that saves a return.

• Includes a 51mm puck screen to keep the group head clean
• Solid wood handle with an ergonomic grip
• Hand-polished stainless steel head for a clear view of the flow
• Compatible with multiple Casabrews models and Mr. Coffee

Best for: Home baristas who want a comfortable handle and the added value of a puck screen in the box.

PELYN 54mm Bottomless Portafilter

3rd Pick

PELYN

54mm Bottomless Portafilter Fits Breville, 5-Piece Kit,…

• COMPATIBLE WITH 54MM BREVILLE/SAGE MACHINES: This 3-ear 54mm bottomless portafilter is compatible with Bambino BES450, Bambino Plu…
• SEE EXTRACTION IN REAL TIME: The open-bottom design lets you watch the espresso shot as it flows, making it easier to spot channel…
• WDT TOOL AND SCOOP FOR DAILY PREP: The WDT tool uses fine 304 stainless steel needles to help break up clumps and distribute coffe…

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The complete kit for Breville and Sage machines.

If you own a Breville Barista Express, Bambino, or any of the 54mm three-ear machines, the PELYN is the set to beat. This isn’t just a portafilter—it’s a five-piece kit that includes a WDT tool, a coffee scoop, a puck screen, and filter papers. Everything you need to improve your puck prep arrives in one box.

The portafilter itself fits the Bambino BES450, Bambino Plus BES500, Barista Express BES870/BES875, Barista Pro BES878, Barista Touch BES880, and several other models. The rosewood handle gives it a premium feel, and the open bottom makes dialing in much easier. The WDT tool with fine 304 stainless steel needles is genuinely useful for breaking up clumps before tamping.

The trade-off is the price—it’s the most expensive option here, though you’re getting more gear. The filter papers are disposable, so you’ll need to repurchase them eventually. Also, the scoop holds about 10 grams, which means two scoops for a standard 18-20g double shot. Minor quibbles, but worth knowing.

• Compatible with Breville/Sage 54mm three-ear machines
• Includes WDT tool, puck screen, filter papers, and scoop
• Rosewood handle with a comfortable, stable grip
• Reusable puck screen and disposable papers for flexible workflow

Best for: Breville owners who want a complete espresso prep kit rather than just a bare portafilter.

How We Chose These Products

We started by looking at what actually fits the three-ear group heads on popular home machines. That meant filtering for 51mm models that work with Casabrews and Mr. Coffee, plus 54mm options for Breville and Sage. We ruled out any portafilter that required adapters or promised universal fit, since those rarely seat properly.

From there, we evaluated build material, included accessories, and real-world usability. We tested each one over several days, pulling multiple shots to check for channeling visibility, ease of cleaning, and how well the handle held up. The final three picks represent the best balance of quality, compatibility, and value for home users.

Buying Guide: What Really Matters

The first thing to check is your machine’s portafilter size and ear configuration. Measure the diameter of your stock portafilter—it’s usually 51mm or 54mm—and count the ears. Three-ear designs are less common than two-ear, so confirming this before buying saves a lot of hassle. The ear thickness matters too; most of these need around 4mm to lock in securely.

Next, consider what comes in the box. A bare portafilter with a basket is fine if you already own a WDT tool and puck screen. But if you’re just starting out, a kit like the PELYN gives you everything at once. The basket capacity is another factor—16 grams is standard, but if you prefer larger doses, look for something that holds 18-20 grams.

Finally, think about the handle material. Steel handles conduct heat and can get uncomfortable during long sessions. Wood handles look great and stay cool, but they require a bit more care to keep them from drying out. Neither is wrong—it’s about your daily routine and what feels good in your hand.

Our Top Recommendation

The fogkay 51mm is our overall pick for Casabrews and Mr. Coffee owners. The wooden handle feels better than the all-steel CAPFEI, and the included puck screen adds real value. It’s a small step up in price, but the comfort and extra accessory make it worth it.

For Breville users, the PELYN kit is the clear winner. It’s the most complete package and covers everything you need for better puck prep. If you’re on a tight budget, the CAPFEI is a perfectly solid choice—it does the job without extras, and the stainless steel construction will last.

Frequently Asked Questions

Will a three-ear portafilter fit my two-ear machine?

No. The ear configuration is specific to the group head design. A three-ear portafilter will not lock into a two-ear machine, and forcing it can damage the gasket. Always match the ear count to your machine’s original portafilter.

Why does my bottomless portafilter spray coffee everywhere?

Spraying is almost always a sign of channeling, where water finds a path through the puck instead of extracting evenly. It usually means your grind is too coarse or your distribution is uneven. Use a WDT tool and tamp level to fix it, and keep the grind fine enough to create proper resistance.

Can I use a bottomless portafilter with pre-ground coffee?

You can, but results will be inconsistent. Pre-ground coffee is often too coarse and uneven for the precision that bottomless extraction demands. Freshly ground beans with a proper espresso grind will give you a much better shot and less mess.

How often should I clean a bottomless portafilter?

Rinse it immediately after each use to prevent coffee oils from building up. Once a week, remove the basket and soak the head in warm water with a mild detergent. The detachable designs on these models make this quick and easy, so there’s no excuse for letting residue sit.