MiiCoffee DF64 II Replacement Guide: Burrs, Dosing Cup, and Wear Parts

My DF64 II started grinding coarser than usual last month. The dial sat in the exact same spot I’d used for weeks, yet the shots ran fast. I figured the burrs had finally worn down after months of daily espresso. Before ordering a MiiCoffee DF64 II replacement part, I checked which piece was actually failing. This guide covers diagnosing the real cause, the tools you need, and the exact swap steps for burrs, the dosing cup, and other wear parts.

When Does the DF64 II Actually Need a Part Replaced?

Most “my grinder is broken” symptoms are wear or buildup, not failure. Static clumps returning, a gritty dial, or grind that drifts coarser usually points to something simpler than a broken part. Real replacement only makes sense once a specific piece is worn, cracked, or physically loose.

A few patterns are worth knowing before you order anything:

• Static returning despite the plasma generator (the grinder’s built-in ionizer) usually means probe buildup, not a dead ionizer.
• A stepless dial that feels gritty or skips points to a worn adjustment collar.
• Beans jumping or jamming often means the anti-popcorn disc is cracked or missing.
• Grind that’s suddenly coarser at the same setting almost always means worn burr faces.

Before you order anything, rule out grounds buildup in the exit chute and burr chamber. A clogged chamber mimics worn burrs closely—cleaning fixes that; new burrs won’t.

Flat burrs like the DF64 II’s stock 64mm set don’t wear on a calendar. They’re rated more by how many kilograms of beans have passed through them. Most home grinders in this class hold their edge for a few hundred kilograms before the teeth visibly round off, though heavy daily use shortens that window. If your grind keeps drifting coarser at the same dial setting after a deep clean, that’s your real signal it’s time for new burrs—not the calendar.

Tools and Replacement Parts You’ll Need

You need a Phillips screwdriver, a small hex key for the burr carrier screws, and a soft brush. Depending on the job, you’ll also want a replacement burr set, dosing cup, or anti-popcorn disc.

Tools:

• Phillips screwdriver
• 2–2.5mm hex key
• Nylon or burr brush
• Microfiber cloth
• Small parts tray, so screws don’t roll away
• Digital scale, for checking dose weight after the swap

Common replacement parts, with U.S. pricing from MiiCoffee’s own shop (verify current prices before ordering):

Part	Price
Stock stainless steel 64mm burr set	~$49
Red Titanium 64mm burr set (upgrade)	~$69
58mm aluminum dosing cup	~$19.99
58mm metal dosing cup	~$19.99
58mm plastic dosing cup	~$9.99

SSP and DLC-coated burrs are popular upgrades too, but MiiCoffee doesn’t sell them directly—those come from third-party burr makers, and pricing there shifts often enough that it’s worth checking live listings before you order.

One note on bellows hoppers and the anti-popcorn disc: neither shows up as a standalone item on MiiCoffee’s current parts page. If yours needs replacing, contact MiiCoffee support directly rather than hunting for a listing that may not exist.

Step-by-Step Burr Replacement Guide

Swapping the 64mm flat burrs takes about 10–15 minutes once the grinder is unplugged and the hopper is empty. No special tools beyond a hex key are needed for this miicoffee df64 ii replacement job.

1. Unplug the grinder and remove the hopper and bellows.
2. Turn the stepless dial to its widest setting. This loosens tension on the burr carrier.
3. Remove the burr carrier screws. Note their positions — they aren’t always the same length.
4. Lift out the upper burr, then remove the lower burr from the motor shaft.
5. Clean the burr chamber and shaft of leftover grounds and oil.
6. Seat the new lower burr on the shaft, then reinstall the upper burr and carrier. Tighten the screws evenly.
7. Reset the dial to a mid-range point and run a test grind before dialing in for espresso.

That 10-to-15-minute window is a rough estimate, not a lab-timed figure — your mileage will vary with how gunked-up the chamber is.

Swapping the Anti-Popcorn Disc, Dosing Cup, and Hopper Bellows

These three parts are the easiest fixes on the DF64 II. No tools are needed for the dosing cup or bellows, and the anti-popcorn disc just pops out.

The anti-popcorn disc sits loose inside the hopper base. Replace it if it’s cracked or if beans are audibly bouncing instead of feeding smoothly into the burrs.

The dosing cup wears at the rim over months of knocking against the portafilter rest. Check the edge for burrs or sharp spots before you keep using it—a rough rim is your cue to swap it.

The rubber bellows can lose elasticity after roughly a year of daily compressions. A stretched or torn bellows won’t flush trapped air and grounds the way a fresh one does. If the dial or disc suddenly feels stiffer or looser than it did last week, that’s the tell—not some vague sense that something’s off.

A Wobbly Dial Turned Into a Full Burr Swap

Here’s how a minor symptom on my own grinder escalated into a full part replacement and what actually fixed it. For a broader look at the grinder’s performance, workflow, and overall ownership experience, see our MiiCoffee DF64 II review. 

Situation: Daily home grinding, dialing in for espresso every morning, month after month.

Observation: The stepless collar started feeling gritty. Grind size drifted noticeably coarser at the same dial setting, even right after cleaning. At first I assumed it was just buildup.

Action: I pulled the burrs and checked them under a light. The outer teeth showed visible rounding and light pitting—not just packed grounds.

Result: A new stock burr set brought grind consistency back, and the dial moved smoothly again. Extraction times returned to normal within the first few shots after re-zeroing, and the whole fix took under twenty minutes.

Post-Replacement Calibration and Troubleshooting

Run a test grind before pulling a real shot after any part swap. New burrs need a quick recalibration pass, since the zero point can shift slightly during installation.

Grind 5–10 grams of beans as a seasoning pass and discard it. Reset the dial to a known reference point. Then grind a normal dose and check the flow and timing.

A few things are normal right after a miicoffee df64 ii replacement:

• The old dial setting will grind finer or coarser than before—expected, since burrs need re-zeroing.
• Static returning for the first few doses — normal, since handling the parts adds a little friction charge.
• Dosing cup wobble — check that it’s seated flush in the portafilter rest, not the burr chamber.

If the motor doesn’t engage at all after reassembly, stop. That points to a wiring or motor issue, not a wear part, and it’s worth contacting support instead of digging further on your own.

FAQ

How often do the stock burrs on the DF64 II actually need replacing? 

It varies a lot with bean volume. Flat steel burrs on single-dose grinders are commonly discussed in the range of a few hundred kilograms before performance drops, not on a fixed schedule.

Does replacing the burrs void the MiiCoffee warranty? 

MiiCoffee’s stated warranty runs one year from the date you receive the grinder, and it explicitly excludes wear-and-tear parts like burrs from free replacement. Self-installed swaps of other parts can still affect coverage depending on the reason for failure, so it’s worth reading the terms directly before you start.

Can I use aftermarket SSP or DLC burrs instead of OEM stainless steel? 

Yes. The DF64 II’s 64mm burr mount fits common aftermarket flat burr sets, though it’s worth checking fitment against your specific carrier depth first.

Is the 58mm dosing cup food-safe? 

The metal and aluminum versions are food-grade, fine for direct contact with grounds. They’re not dishwasher-rated the way a plastic part might be.

What if my replacement burr doesn’t seat flush on the shaft? 

That’s usually leftover grounds or oil residue on the shaft. Clean it fully before trying again — don’t force the burr down.

Where can I buy genuine MiiCoffee replacement parts in the U.S.? 

Through MiiCoffee’s official shop or its Amazon storefront. Third-party sellers carry compatible aftermarket burrs, but not OEM small parts like the dosing cup or bellows.