How to Clean the MiiCoffee DF64 II Single Dosing Coffee Grinder

Written by Mike Chen, 6 years hands-on experience with single-dose flat burr grinders. Last updated: August 25, 2026.

Grounds started clinging to my dosing cup after three weeks of daily grinding. No amount of tapping shook them loose. That’s what sent me searching for how to clean MiiCoffee DF64 grinders in the first place. It covers daily wipe-downs and a full chamber teardown. It also covers chute care and ionizer upkeep, plus the mistakes behind most of these problems.

How Often Should You Clean the MiiCoffee DF64 II?

Wipe the chute and dosing cup after every grind. Deep-clean the burr chamber every one to two weeks with normal home use. Do a full teardown once a month.

• Daily: brush the chute and catch cup, wipe the outside
• Weekly to biweekly: pull the upper burr and brush out the chamber
• Monthly: full teardown, check the burrs and anti-popcorn disc for wear
• Grind oily dark roast beans more often; light roast can stretch the interval if you’re grinding less
• MiiCoffee hasn’t published an exact cleaning interval for this model, so the daily-weekly-monthly split above matches the cadence most flat-burr grinder makers recommend

What You’ll Need Before You Start Cleaning

Most DF64 II cleanings need nothing beyond the brush that shipped in the box. Add a dry cloth and you’re set for weekly upkeep. The grinder opens for a full teardown without tools, so you won’t need a screwdriver either.

• The white cleaning brush included in the box (it’s easy to miss inside the packing foam)
• A dry microfiber cloth — skip liquids near the burrs and the plasma generator
• Grinder cleaning tablets, such as Urnex Grindz, for monthly oil removal
• A soft-bristle toothbrush for tight spots around the anti-popcorn disc
• Anything that touches the chamber, brush or tablet alike, should be food-safe. It’s touching your beans directly.

How to Clean the Grind Chamber and Burrs, Step by Step

Unplug the grinder and pop open the chamber using its tool-free release. Brush out the grounds and oil film, then close it back up and re-zero the dial. Here’s the full sequence for anyone looking up how to clean MiiCoffee DF64 burrs specifically:

1. Unplug the grinder and remove the dosing cup
2. Lift off the bellows and hopper, then set them aside
3. Release the upper burr carrier using the grinder’s tool-free latch
4. Brush loose grounds from the lower burr and the chamber walls
5. Wipe oil film off both burr faces with a dry cloth. Skip water on the burrs. Stainless steel resists rust, but a damp chamber still isn’t worth the risk.
6. Clear the anti-popcorn disc of any grounds stuck underneath it
7. Reseat the upper burr in its original position and close the latch
8. Power the grinder on and re-zero the stepless dial before your next grind

A dry chamber wipe-down like this takes about five minutes once you’ve done it a couple of times. Most home users notice a visible oil film building up after two to three weeks of daily grinding, which is roughly why the biweekly interval above works so well.

If your burrs eventually feel dull no matter how well you clean them, that’s a separate issue. Look into upgrading to SSP or coated burrs instead.

How to Clean the Exit Chute and Plasma Generator

The plasma generator inside the chute cuts static on its own. Grounds still cling to the probes over time. A quick brush and a dry wipe keep the ionizer working the way it should.

• Brush the chute walls, focusing near where the probes wrap around the inside
• Wipe the plasma generator contacts dry. Skip water and solvents near the electronics.
• Check that the anti-popcorn disc still swings freely after you clean the chute
• If static comes back despite regular cleaning, oil buildup is the usual cause. It’s rarely a failed ionizer.
• MiiCoffee rates the DF64 II’s retention at under 0.1 grams, even without using the bellows. Leftover grounds after a clean usually point to a skipped bellows step, not a chamber problem.

Mini Case Study: Static Buildup After Weeks of Daily Use

I ran the grinder daily for several weeks on a medium roast, one dose each morning. Grounds began clinging to the dosing cup rim despite the ionizer, and the chute felt slightly gritty to the touch.

I pulled the chamber apart, brushed out the chute, and wiped the plasma generator contacts dry. I also gave the bellows several firm presses on the next few grinds, the way the manual recommends. The static cling dropped off within a day or two of that routine.

That matches what other DF64 owners report: the ionizer needs a clean contact surface to do its job. A dirty probe, not a broken one, is usually the culprit behind lingering static on this style of grinder.

Common Cleaning Mistakes to Avoid

The two biggest mistakes are using water inside the chamber and skipping the bellows. Both cause the static and retention complaints people often blame on the grinder itself.

• Using water or liquid cleaners inside the chamber: moisture near the burrs and the plasma generator risks corrosion. Stick to dry brushing and food-safe tablets.
• Skipping the bellows after grinding: leftover grounds sit in the chamber and mix into your next dose. That stales the fresh grind fast.
• Adjusting the dial while the grinder is off: this can compress leftover grounds and jam the burr gap on your next cleaning attempt
• Over-tightening the burr carrier on reassembly: uneven pressure throws off burr alignment and grind consistency

Even after a thorough cleaning, if problems like motor stalls, a misaligned dial, or persistent static still show up, the issue may go beyond cleaning. Check out our DF64 II troubleshooting guide—it covers step-by-step fixes for motor, dial, and static issues. 

FAQ

Can I use a vacuum on the DF64 II instead of the included brush? 

Light suction is fine around the catch cup area. Avoid pointing it directly at the burrs — static from a vacuum hose can pull in more grounds than it removes.

Do I need grinder cleaning tablets, or is brushing enough? 

Brushing covers daily and weekly upkeep on its own. Tablets like Urnex Grindz help with monthly oil buildup, especially on darker roasts, and cost roughly three dollars per cleaning when used every two to three weeks.

Does opening the burr chamber void the MiiCoffee warranty? 

MiiCoffee backs the DF64 II with a one-year manufacturer warranty, and the chamber is designed to open tool-free for routine cleaning. Swapping burrs or parts beyond normal cleaning is a different matter, so check with your seller before going further than a standard brush-and-wipe.

Is the DF64 II’s dosing cup dishwasher-safe? 

The dosing cup is food-grade aluminum, but hand-washing protects the finish better than a dishwasher cycle. Check your specific listing’s care notes if you’re unsure.

How long do stainless steel burrs last before cleaning stops helping? 

Burr life gets measured in total coffee ground rather than a calendar date. Consumer stainless steel burrs like the DF64 II’s typically last around 450 kilograms, or roughly 1,000 pounds, before dulling sets in. Past that point, no amount of cleaning restores the grind quality — it’s time to consider an upgrade to SSP or Red Titanium burrs.

What’s the hopper capacity for daily grinding? 

The DF64 II holds about 30 grams of beans without the bellows attached, or up to 80 grams with the bellows and hopper in place. That’s plenty for single-dose espresso or a cup or two of pour-over at a time.