Hario Mini Mill Slim Hand Coffee Grinder Review

Recommended Accessories:

• Cleaning brush set for maintaining burrs
• Compact coffee scale for precise measurements
• Airtight container for storing beans

Let’s dive into what makes the Hario Mini Mill Slim tick. This little grinder has become a favorite among coffee enthusiasts, and after using it extensively, I understand why.

Key Specs at a Glance:

• Length: 7.5” (19 cm)
• Diameter: 1.8” (4.6 cm)
• Weight: 8.75 oz (248g)
• Capacity: 24g (enough for about 2 cups)
• Materials: Clear plastic body, ceramic burrs
• Color options: Clear, Black

The magic of this grinder lies in its ceramic conical burrs. Unlike cheaper blade grinders that chop beans haphazardly, these burrs crush the beans consistently, giving you better control over your grind size. I’ve found the grind adjustment mechanism intuitive - just twist the knob under the burrs clockwise for finer grounds or counterclockwise for coarser.

One thing that’s struck me about the design is how thoughtful it is. The clear plastic body lets you watch the grinding process (oddly satisfying), while the rubber base keeps it stable on your counter. The removable handle is a smart touch, making it more packable for travel.

While the plastic construction might raise durability concerns, I’ve found it surprisingly robust. The body has survived several camping trips in my backpack without issues. That said, you’ll want to handle the removable crank with care - it’s the one part that could potentially go missing during travel.

The 24g capacity hits a sweet spot for most brewing methods. It’s enough for 1-2 cups of coffee, which works well for individual use or couples. If you’re brewing for a group though, you’ll need multiple grinding sessions.

The beauty of the Hario Mini Mill Slim lies in its simplicity. Here’s the rundown on getting those beans ground just right:

1. Loading Up:

• Pop off the top lid
• Pour in your beans (up to 24g)
• Replace the lid snugly

2. Setting Your Grind:

• Find the adjustment nut under the burrs
• Clockwise turns = finer grind
• Counterclockwise = coarser grind
• Pro tip: Count the clicks from zero (burrs touching) to replicate your favorite settings

3. The Grinding Process:

• Attach the handle firmly
• Start cranking clockwise
• Keep a steady, comfortable pace
• Listen for changes in sound - when the crunching stops, you’re done

Typically, you’re looking at about 1-2 minutes of grinding for a single cup. Finer grinds take longer than coarse ones - my morning pour-over usually takes about 90 seconds to grind.

The ceramic burrs are the real heroes here. They’re heat-resistant, which means they won’t warm up your beans during grinding (yes, that can affect taste). Plus, unlike metal burrs, they’ll never rust and don’t need sharpening.

One quirk worth mentioning: the grinder works best when you keep it vertical. I learned this the hard way when trying to grind while walking - not recommended! Find a stable surface, and you’ll get much more consistent results.

After months of use, here’s my honest take on where the Hario Mini Mill Slim shines and where it could use some improvement:

What I Love:

• Travel-Ready Design: Slides right into a backpack without hogging space
• Consistent Grounds: Those ceramic burrs really deliver, especially for medium grinds
• Build Quality: Surprisingly durable for a plastic body
• No Power Needed: Perfect for camping or hotel rooms
• Price Point: Gives pricier grinders a run for their money

What Could Be Better:

• Grinding Time: It’s a workout for larger batches
• Small Capacity: 24g limit means multiple grinds for group brewing
• Coarse Grind Issues: Sometimes inconsistent for French press
• Plastic Parts: Can wear over time with heavy use
• Handle Design: Could be more ergonomic for longer grinding sessions

During a recent camping trip, I really appreciated the grinder’s portability and simplicity. No batteries to die, no charging needed - just good old elbow grease. But I also noticed how the grinding process became a bit tedious when making coffee for four people.

The grind consistency really impresses me for pour-over and AeroPress brewing. However, when I tried super coarse grinding for cold brew, I noticed more inconsistency in the particle size. It’s not a deal-breaker, but worth keeping in mind if you’re mainly brewing methods that require very coarse grounds.

After chatting with other users and reading through reviews, I’ve found most people echo these sentiments. The common theme? It’s a reliable little workhorse that requires some patience but delivers where it counts.

As someone who’s lugged this grinder through airports and stuffed it in countless backpacks, I can vouch for its travel-friendliness. Let’s break down what makes it a solid travel companion:

Size & Weight:

• Height: 7.5” (19 cm) - about the size of a water bottle
• Weight: 8.75 oz (248g) - lighter than a typical paperback
• Removable handle for compact packing

The size really is perfect for travel. I’ve found it fits nicely in a backpack’s water bottle pocket or slips into any carry-on without eating up much space. The removable handle is genius for packing - just wrap it in a sock to prevent scratches.

Durability for Travel: During six months of regular travel use, I’ve noticed:

• Plastic body handles minor bumps well
• Ceramic burrs stay sharp and don’t rust
• No electronic parts to fail
• Rubber base stays grippy

One travel tip I’ve learned: store some beans in the hopper during short trips. It saves space by eliminating the need for a separate container. Just make sure the lid’s on tight!

The only real weakness I’ve found is the handle connection point - it can get a bit loose after repeated assembly/disassembly. Nothing a quick tightening can’t fix, but worth keeping an eye on during longer trips.

From my experience, the Hario Mini Mill Slim is perfect for several types of coffee lovers:

The Frequent Traveler: If you’re constantly hopping between hotels or vacation rentals, this grinder’s compact size and reliability make it an ideal travel buddy. I’ve used mine in countless hotel rooms, and it’s never let me down.

The Outdoor Enthusiast: Campers and hikers will appreciate its lightweight design and no-power-needed operation. During a recent backpacking trip, it was a game-changer for enjoying fresh coffee at sunrise.

The Space-Conscious Coffee Lover: Living in a tiny apartment? This grinder takes up minimal counter space and can easily hide away in a drawer when not in use.

The Coffee Explorer: If you’re just starting to experiment with different brewing methods and grind sizes, the adjustable settings and affordable price point make this a great entry point.

The Manual Brewing Fan: Pour-over and AeroPress enthusiasts will find the grind consistency particularly well-suited to their needs. The ability to fine-tune your grind size really helps dial in your brew.

Let’s be honest - the Hario Mini Mill Slim isn’t for everyone. Here’s who might want to look elsewhere:

The Batch Brewer: If you regularly make coffee for groups or family, the small capacity will frustrate you. I learned this the hard way during a family camping trip - grinding for six people took forever.

The Espresso Perfectionist: While it can grind fine enough for espresso, you’ll get better results from a dedicated espresso grinder with more precise adjustments. I’ve tried it for espresso, and while it works, it’s not ideal.

Those with Hand Strength Issues: Manual grinding requires effort. If you have arthritis or hand strength concerns, an electric grinder would be a better choice.

The Morning Rusher: If your morning routine is tight on time, the manual grinding process might not fit your schedule. Electric grinders are definitely faster.

Better Alternatives for These Users:

• For batch brewing: Consider the Baratza Encore electric grinder
• For espresso: Look into the 1Zpresso JX-Pro
• For easier operation: Any quality electric burr grinder
• For speed: The OXO Brew Conical Burr Grinder

Remember, while this grinder excels in portability and value, it’s important to choose a grinder that fits your specific coffee routine and needs.

After a year of regular use, here’s what I’ve learned about living with the Hario Mini Mill Slim:

Durability Notes:

• Ceramic burrs maintain their edge impressively well
• Plastic body shows minor scratches but remains structurally sound
• Grind adjustment mechanism stays reliable with proper care
• Handle connection can loosen but is easily tightened

Performance Over Time: The grinder’s sweet spot remains medium-fine to medium-coarse grinds. I’ve noticed minimal degradation in grind consistency, though the adjustment ring might need occasional recalibration.

One surprising discovery: the clear plastic body, while showing some cosmetic wear, actually helps you spot when it’s time for cleaning. You can see coffee oils building up, which serves as a helpful reminder for maintenance.

Common Issues:

• Plastic threads can wear if overtightened
• Grind settings may drift slightly during vigorous grinding
• Handle sometimes needs realignment after heavy use

A fellow coffee enthusiast shared an interesting tip: marking your favorite grind settings on the body with a permanent marker helps track any drift in calibration over time.

The most impressive aspect? Despite daily use, the ceramic burrs show no signs of dulling. This really speaks to the quality of materials where it matters most.

Keeping your Hario Mini Mill Slim in top shape isn’t complicated, but it does require some attention. Here’s what I’ve learned about maintenance:

Daily Care:

• Brush out loose grounds after each use
• Wipe down the exterior with a dry cloth
• Store in a dry place

Weekly Deep Clean:

1. Disassemble completely
2. Brush all parts thoroughly
3. Use a soft brush for the burrs
4. Wipe with a slightly damp cloth if needed
5. Dry thoroughly before reassembly

Pro Tips from Experience:

• Never soak the burrs - they can rust at the metal mounting points
• Use a small paint brush for hard-to-reach areas
• Consider grinding a few dry rice grains monthly to absorb oils
• Check handle tightness regularly

Common Issues and Fixes:

• Sticky grinding: Usually means it’s time for cleaning
• Loose handle: Tighten the screw at connection point
• Inconsistent grounds: Check burr alignment
• Drifting settings: Clean and recalibrate

Storage Tips:

• Keep in a dry place
• Avoid direct sunlight (can make plastic brittle)
• Store handle attached to avoid loss
• Consider a small storage bag for travel

Remember, a well-maintained grinder not only lasts longer but also produces better coffee. These simple steps have kept my grinder performing like new for over a year.

Troubleshooting Guide:

• Squeaking during grinding? A drop of food-grade mineral oil on the shaft can help
• Burrs feel stuck? Check for trapped beans or debris
• Grind size inconsistent? Verify the burr carrier is properly seated

Investing a few minutes in regular maintenance pays off in consistently good coffee and a longer-lasting grinder.

The Hario Mini Mill Slim has some interesting environmental angles worth considering:

Energy Footprint:

• Zero electricity use
• No batteries to dispose of
• Manual operation reduces carbon footprint

Materials Impact:

• Ceramic burrs last for years
• Plastic body is durable and recyclable
• Simple construction means fewer materials overall
• Minimal packaging compared to electric grinders

Longevity Benefits:

• Replaceable parts extend lifespan
• Simple mechanism means less waste
• Easy repairs reduce likelihood of disposal

Waste Reduction:

• Precise grinding reduces coffee waste
• No paper filters or pods needed
• Packaging is minimal and recyclable

During my camping trips, I’ve really appreciated how this grinder lets me enjoy fresh coffee without generating extra waste or needing power. It’s a small win for sustainability in our daily coffee ritual.

Having used both budget and high-end grinders, here’s my take on the Hario Mini Mill Slim’s value proposition:

Value Highlights:

• Ceramic burrs typically found in pricier grinders
• Consistent grind quality rivals more expensive manual options
• Durable construction ensures longevity
• Versatile enough for various brewing methods

Cost Efficiency:

• No electricity costs
• Minimal maintenance expenses
• Long lifespan with proper care
• Replaceable parts available

Performance Areas:

• Excels at medium grinds
• Good for pour-over and AeroPress
• Decent for French press
• Adequate for occasional espresso

Long-Term Value: The initial investment might seem modest compared to electric grinders, but don’t let that fool you. This little grinder can match or outperform entry-level electric burr grinders in grind consistency.

During a recent coffee tasting with friends, the Hario surprised everyone with its ability to produce balanced, even grounds. It might take more time and effort, but the results speak for themselves.

After countless grinding sessions, I’ve discovered some helpful techniques:

1. Perfect Your Grip:

• Hold grinder between knees while seated
• Use dominant hand for smoother cranking
• Keep movements steady and rhythmic

2. Dial In Your Grind:

• Start with burrs touching
• Count clicks outward for consistency
• Mark preferred settings on body
• Take notes of successful combinations

3. Travel Smart:

• Pre-weigh beans into small containers
• Pack handle separately to prevent damage
• Use grinder as bean storage in a pinch

4. Cleaning Hacks:

• Tap sides to clear stuck grounds
• Use a soft makeup brush for burrs
• Grind rice for deep cleaning
• Keep a dedicated cleaning brush handy

5. Stability Tricks:

• Place on damp paper towel for grip
• Use consistent speed for best results
• Listen to grinding sound for consistency

6. Time-Saving Tips:

• Prep beans night before
• Multi-task during grinding
• Keep track of grinding time for reference

Here are real answers to questions I frequently get about the Hario Mini Mill:

1. Q: How long does it take to grind for one cup? A: About 1-2 minutes for a typical pour-over serving. Finer grinds take longer.

2. Q: Can it handle espresso grinding? A: Yes, but expect to spend extra time and effort. It’s better suited for medium grinds.

3. Q: Will it break if I drop it? A: The plastic is surprisingly durable, but avoid drops. The handle is most vulnerable.

4. Q: How do I know when to clean it? A: Clean after every few uses or when you notice grounds sticking to the walls.

5. Q: Does the grind stay consistent? A: Yes, especially for medium grinds. Coarse settings show more variation.

6. Q: Can I grind for cold brew? A: Absolutely, though you’ll need multiple batches for larger quantities.

7. Q: What’s the best way to travel with it? A: Remove the handle, wrap in a sock or cloth, pack in center of bag.

8. Q: Are replacement parts available? A: Yes, Hario sells replacement burrs and handles.

9. Q: How many turns for pour-over grind? A: Usually 7-9 clicks from fully tight, but experiment for your taste.

10. Q: Worth it for daily use? A: Yes if you brew 1-2 cups at a time and enjoy the manual process.

After months of daily use, countless travel adventures, and numerous coffee experiments, the Hario Mini Mill Slim has proven itself a reliable companion in my coffee journey.

This grinder really shines in its sweet spot: providing fresh, consistently ground coffee for individual servings while being portable enough to take anywhere. The ceramic burrs deliver reliable performance, especially for medium grinds perfect for pour-over and AeroPress brewing.

Sure, it has its quirks. The manual grinding takes time, and you won’t be brewing for large groups without some patience. But these trade-offs feel reasonable given its compact size and reliable performance.

For travelers, outdoor enthusiasts, and coffee lovers in small spaces, this grinder hits a sweet spot between quality and convenience. It’s not trying to be the fastest or the fanciest - instead, it focuses on being dependable and practical.

The journey to better coffee doesn’t always need fancy equipment. Sometimes, a simple, well-designed tool like the Hario Mini Mill Slim is exactly what you need to elevate your daily brew.