Porlex Mini II: The Japanese Hand Grinder That Fits Inside Your AeroPress

The Porlex Mini II is a compact Japanese hand grinder that's been a favorite among travel coffee enthusiasts for years. Its claim to fame is simple: it fits inside an AeroPress, creating the most space-efficient brewing kit possible. The Mini II uses ceramic conical burrs, holds about 20 grams of beans, and weighs just 235 grams. If you're looking for a small, reliable hand grinder for travel or occasional home use, the Porlex Mini II deserves your attention.

I've used the Mini II as a travel companion on dozens of trips and as a backup grinder at home. I'll cover the build, grind quality, the ceramic vs. Steel burr debate, and how it compares to newer competitors that have entered the market since Porlex first established this category.

Build Quality and Design

The Porlex Mini II is made in Japan from stainless steel, and it feels like it. The body is a single cylindrical tube with a brushed finish that resists scratches and fingerprints. At about 5 inches tall and 1.9 inches in diameter, it's one of the most compact hand grinders that uses real conical burrs.

The handle attaches to the top with a simple clip mechanism and removes for storage. This is both a strength and a weakness. Removing the handle makes the grinder incredibly compact, but the handle attachment point has some play in it. You'll feel a slight wobble while cranking, which isn't a big deal functionally but doesn't inspire confidence from a precision standpoint.

The "II" version improved on the original Porlex Mini in a few ways: the adjustment click mechanism is smoother, the hopper capacity is slightly larger, and the handle clips on more securely. If you're looking at used Porlex grinders, make sure you're getting the II version.

The AeroPress Trick

The Mini II was designed with an outside diameter that matches the inside diameter of an AeroPress brewing chamber. You can slide the grinder right inside the AeroPress, cap the plunger on top, and pack both in a single AeroPress carrying case. This combination has become the unofficial travel coffee setup for backpackers, cyclists, and anyone who values compact gear.

Ceramic Burrs: Pros and Cons

Porlex uses ceramic conical burrs rather than the stainless steel burrs found in most competitors. This is a deliberate choice with real trade-offs.

Advantages of Ceramic

  • No heat transfer. Ceramic doesn't conduct heat the way steel does, so the burrs stay cool during grinding. This preserves volatile flavor compounds, especially in light and medium roasts.
  • Corrosion resistance. Ceramic doesn't rust, which makes the Porlex ideal for humid environments, beach trips, or camping near water.
  • Longevity. Ceramic burrs maintain their sharpness longer than steel burrs in theory, though in practice the difference is hard to measure for home-use volumes.

Disadvantages of Ceramic

  • Brittleness. Drop the grinder on a hard surface, and the ceramic burrs can chip or crack. Steel burrs would survive the same impact without damage. I've never broken mine, but I'm careful with it.
  • Coarser particle distribution. Ceramic burrs generally produce a slightly wider range of particle sizes compared to well-machined steel burrs. This translates to less clarity in the cup, particularly at finer grind settings.
  • Slower grinding. The ceramic material doesn't bite into beans as aggressively as sharp steel burrs, which means more rotations per gram of coffee.

Grind Consistency and Range

The Mini II's grind quality is decent for a travel grinder at this price point, but it's been surpassed by newer competitors with steel burrs. At medium settings (pour over and drip), the particle distribution is acceptable. You'll get a good cup of coffee, though it won't have the same clarity and definition as a cup ground on a Timemore or 1Zpresso of similar size.

For AeroPress, which is forgiving of grind inconsistency due to its immersion-style brewing, the Mini II performs well. I typically set it around 6 to 8 clicks from closed for AeroPress, and the results are consistently enjoyable.

Setting the Grind Size

The adjustment works by turning a nut at the bottom of the inner burr shaft. Each click represents one step. The clicks are distinct and easy to count. My typical settings:

  • Espresso (not ideal): 2 to 4 clicks
  • AeroPress: 6 to 8 clicks
  • Pour over: 8 to 11 clicks
  • Drip: 11 to 13 clicks
  • French press: 13 to 16 clicks

At the finer end (espresso territory), the grind isn't consistent enough for proper espresso extraction. The ceramic burrs produce too many fines mixed with larger particles, which leads to channeling and uneven extraction. I wouldn't recommend the Mini II for espresso use.

Grinding Speed and Effort

The Mini II is not a fast grinder. For 15 grams of medium-roast beans at an AeroPress setting, expect about 60 to 75 seconds of continuous cranking. The short handle provides limited leverage, and the ceramic burrs require more rotations than steel to process the same amount of coffee.

Light roasts take even longer, sometimes pushing past 90 seconds for a single dose. My forearm definitely feels it after grinding light-roast beans on the Mini II.

The body diameter is comfortable to grip, and the weight distribution keeps it stable in your hand. But if you're grinding for two people, back-to-back doses will test your patience.

How It Compares to the Competition

The travel hand grinder market has grown significantly since Porlex introduced the Mini. Here's how the Mini II stacks up against the current field:

  • vs. Timemore Chestnut C2: The Timemore has steel burrs, better grind consistency, faster grinding, and a larger capacity. It's also slightly larger and doesn't fit inside an AeroPress. For pure grind quality, the Timemore wins. For compactness, the Porlex wins.
  • vs. 1Zpresso Q2: The Q2 has steel burrs and produces noticeably better grind consistency, especially at finer settings. It's similar in size to the Porlex but slightly heavier. If grind quality is your priority, the Q2 is the better choice.
  • vs. Hario Mini Mill Slim Plus: The Hario is cheaper but has worse grind consistency and a flimsier build. The Porlex is a clear upgrade from the Hario.

The Mini II's competitive edge is its compactness and AeroPress compatibility. If those matter to you, nothing else quite matches it. If you care more about grind quality, newer steel-burr grinders at similar prices outperform it.

For a wider look at hand and electric grinders across all budgets, our best coffee grinder guide covers the full range. The top coffee grinder roundup also highlights the best performers in each category.

Tips for Getting the Best Results

After years with the Mini II, here are a few things I've learned:

  • Don't chase espresso. Use it for AeroPress, pour over, and drip. The ceramic burrs aren't precise enough for proper espresso grinding.
  • Shake while grinding. Gently rocking the grinder back and forth while cranking helps beans feed into the burrs more evenly and reduces jamming.
  • Clean the burrs monthly. Even though ceramic resists oil buildup better than steel, coffee oils still accumulate. Brush the burrs out monthly for the best flavor.
  • Store it inside the AeroPress. If you travel with both, always store the grinder inside the AeroPress chamber. This protects the grinder and saves space.

Frequently Asked Questions

Does the Porlex Mini II fit inside all AeroPress versions?

It fits inside the standard AeroPress and the AeroPress Go. The AeroPress Clear may have slightly different internal dimensions, so check compatibility if you have the newest version.

How long do the ceramic burrs last?

Porlex doesn't publish a specific lifespan, but ceramic burrs used at home-travel frequency (a few times per week) should last five years or more without noticeable degradation. Heavy daily use will shorten that, but ceramic is generally more durable than steel for edge retention.

Can I replace the ceramic burrs with steel burrs?

Not officially. The Porlex Mini II is designed specifically for its ceramic burr assembly, and there are no drop-in steel burr replacements available. If you want steel burrs in a similar form factor, look at the 1Zpresso Q2 or Timemore Slim instead.

Is the Porlex Mini II dishwasher safe?

No. The ceramic burrs and internal components should not be submerged in water. Clean with a dry brush and occasionally wipe the exterior with a damp cloth. Keep water away from the burr assembly and adjustment mechanism.

Where the Mini II Stands Today

The Porlex Mini II is no longer the best travel grinder you can buy for the money. Newer competitors with steel burrs outperform it on grind consistency at similar price points. But no other grinder matches its combination of compactness, AeroPress compatibility, and corrosion resistance. If your travel setup revolves around an AeroPress and you want the most space-efficient kit possible, the Porlex Mini II still earns its place. For everyone else, steel-burr alternatives offer better coffee for the same investment.