MiiCoffee D40+ Single Dose Coffee Grinder - A Feature-Packed Single Dose Coffee Grinder for Enthusiasts

Published on Sept. 11, 2023, 9:06 p.m.

The Cultural and Historical Significance of Coffee Grinding

Coffee grinding has been an integral part of coffee culture since its discovery. The act of grinding coffee beans has evolved from using simple hand-operated tools to sophisticated electric grinders like the MiiCoffee D40+. Historically, coffee grinding methods reflected the technology and culture of the times and were key in spreading coffee across the world. In the Ottoman Empire, finely ground coffee was brewed to make the first versions of what we know today as espresso. Today, the precision of modern grinders like the MiiCoffee D40+ represents a culmination of centuries of technological advancement aimed at perfecting the coffee experience, highlighting the ritualistic importance of fresh coffee grinding in enhancing flavor and aroma.

The MiiCoffee D40+ is a new single dose coffee grinder that packs in features found in more expensive grinders at an accessible price point. Let’s take a closer look at what this grinder has to offer for home coffee enthusiasts.

 MiiCoffee D40+ Single Dose Coffee Grinder


  • Brand: MiiCoffee
  • Model: D40+
  • Type: Electric burr coffee grinder
  • Grind Settings: 95
  • Hopper Capacity: 40g
  • Dimensions: 6.8” x 3.8” x 14”
  • Weight: 6 lbs

The MiiCoffee D40+ Single Dose Coffee Grinder features a sleek metallic black body made of aluminum with stainless steel conical burrs. It is designed specifically for single dosing with its bellows and dosing cup to minimize coffee retention between grinds.

Key Features:

  • 40mm stainless steel conical burrs
  • 95 step grind adjustment
  • Low retention design with bellows
  • Built-in scale and timer
  • Dosing cup magnetically attaches
  • Slim profile takes up minimal counter space

Design & Build Quality

Weighing in at 6 lbs, the MiiCoffee D40+ Single Dose Coffee Grinder has a sturdy build quality lacking in some other affordable electric grinders. The metallic black finish gives it a sleek, modern look perfect for any kitchen.

Its slim profile takes up minimal counter space, making it easy to keep out on your counter. The dosing cup attaches securely to the base with a magnet to keep it steady while grinding.

Principles and History of Coffee Grinders

A coffee grinder is a device used to grind coffee beans into different particle sizes, which directly affects the flavor and taste of coffee.

The history of coffee grinders can be traced back several centuries, when coffee enthusiasts used manual grinders or stone mills to make coffee powder. With the development of technology, electric coffee grinders gradually appeared, providing coffee lovers with a more convenient and precise grinding method. Today, modern coffee grinders combine advanced technology and design, aiming to provide users with the best grinding experience.

Technological Innovation of MiiCoffee D40+

The MiiCoffee D40+ features 40mm stainless steel conical burrs, which contribute to achieving a more uniform grinding effect, thus enhancing the flavor and taste of coffee. Compared to traditional blade grinders, conical burrs offer better control over the particle size, reducing the risk of over-grinding and ensuring the quality of coffee.

Furthermore, the MiiCoffee D40+ is equipped with 95 adjustable grind settings, allowing users to fine-tune according to their preferences and coffee beverage types. This enables users to customize the perfect coffee grounds based on different roasting levels and brewing methods, resulting in a more personalized coffee experience.

Grinding and Coffee Extraction

The grind size of coffee beans is crucial in influencing the extraction rate and ultimately the taste of the coffee. Finer grinds expose more surface area to water, increasing the extraction rate and intensifying the flavor, which is ideal for espresso. On the other hand, coarser grinds slow down the extraction process, suitable for brewing methods like French press, where over-extraction is a risk. The MiiCoffee D40+’s 95 step grind adjustment allows for meticulous control over this process, accommodating a wide range of brewing styles from delicate pour-overs to robust espresso shots.

Why Choose 40mm Stainless Steel Conical Burrs

The 40mm stainless steel conical burrs used in the MiiCoffee D40+ are widely regarded as a superior choice within the industry. The stainless steel material ensures durability and long-lasting precision, while the conical design is preferred because it provides a more uniform grind size, which is crucial for enhancing extraction rates and balance in flavor. This advantage of conical burrs is particularly valuable when precise grind adjustments are required, such as in making espresso.

Grind Quality

The 40mm stainless steel conical burrs deliver a very consistent grind with minimal clumping across its 95 grind settings. This allows you to fine-tune for a wide range of brewing methods, from ultra-fine for espresso to coarse for French press.

While the espresso range is on the finer side, requiring settings around 8-10 for non-pressurized portafilters, you can achieve an even particle distribution ideal for espresso extraction.

Single Dosing Experience

As a true single dose grinder, the MiiCoffee D40+ Single Dose Coffee Grinder excels at minimizing coffee waste and simplifying your morning routine. The bellows provide a simple way to clear out any stale grounds between uses. Just place your desired dose of beans in the hopper, grind into the dosing cup, and give the bellows a pump to clear out any remnants.

The dosing cup also makes it easy to grind directly into your portafilter. Just place it on the magnet, select your grind setting, and you have a freshly ground dose ready for brewing. No need to transfer from an overflowing catch bin or deal with messy ground coffee spills.

Benefits of Single Dosing Grinding

Single dosing grinding, where only the exact amount of beans needed for one serving is ground, ensures maximum freshness and flavor in each cup. This method eliminates the risk of leftover ground coffee becoming stale and impacting the taste of subsequent brews. It also allows for easy experimentation with different bean types and grind settings, making it an ideal choice for coffee enthusiasts who value precision and variety in their brewing process.

Ease of Use & Cleaning

Operation is very straightforward with an easy to read adjustment ring and pulse grinding button. Apart from occasional burr alignment checks, the only cleaning needed is to give the burrs a brushing every few weeks to remove any oils. It’s as simple as it gets for maintenance.

Usage Instructions

Operating the MiiCoffee D40+ is straightforward, requiring only adjustments to the adjustment ring and the use of the pulse grinding button to complete the grinding process. Apart from occasional checks for burr alignment, the only cleaning required is to brush the burrs every few weeks to remove any oils. These maintenance tasks are minimal, making both usage and upkeep extremely convenient.

 MiiCoffee D40+ Single Dose Coffee Grinder

Suitable Uses:

The MiiCoffee D40+ Single Dose Coffee Grinder is a versatile grinder suitable for various brew methods:

  • Espresso: The fine grind range delivers consistent grounds for espresso.
  • Pour-over: Coarser settings work well for drip and pour-over.
  • Aeropress: Middle range settings produce grounds for rich Aeropress coffee.

User Feedback Analysis

The MiiCoffee D40+ Single Dose Coffee Grinder has received overwhelmingly positive feedback from buyers. In over 300 online reviews, it has maintained a 4.5 out of 5 star average rating.

The vast majority of users praise the MiiCoffee D40+ Single Dose Coffee Grinder’s grind consistency and ability to produce fluffy, clump-free grounds perfect for brewing espresso. Many mention they were able to pull balanced shots with full flavor almost immediately after dialing in the grinder. Even novice users found it easy to adjust the settings to grind for various methods from Turkish coffee to French press.

Some users did note a few downsides in their feedback. A small number reported receiving units with defective parts or quality control issues like burr misalignment. Others felt the grounds bin was too small. However, most defects were promptly replaced by MiiCoffee’s responsive customer service.

When it comes to grind quality and low retention, almost all users consider the MiiCoffee D40+ Single Dose Coffee Grinder a superb value for money. It punches far above other electric grinders even close to double its price. Many have commented that it produces coffee comparable to commercial grade grinders costing many times more.


  • Excellent grind quality from 40mm burrs
  • Minimal retention from single dose design
  • Large 95 step adjustment range
  • Sturdy build quality with sleek design
  • Great value for the price


  • Espresso range skews fine
  • Produces some clumping
  • Quality control issues on some units

Value & Warranty

Priced at $199, the MiiCoffee D40+ Single Dose Coffee Grinder delivers exceptional value by including high-end features like stainless steel conical burrs and single dosing in a competitively priced package. MiiCoffee also provides a 1 year warranty to protect your purchase.

For home baristas looking for precise grind quality in a compact single dose format, the MiiCoffee D40+ Single Dose Coffee Grinder hits all the marks at an affordable price point. While the espresso range may need calibrating out of the box, its combination of quality, features, and value make this an easy recommendation for most coffee lovers.


  • Burrs: 40mm stainless steel conical burrs
  • Grind Settings: 95
  • Bean Hopper Capacity: 40g
  • Grounds Bin Capacity: 100g
  • Grinding Speed: 1.5g/sec
  • Motor: 150W
  • Power Requirements: 110-120V, 50/60Hz
  • Dimensions: 6.8” x 3.8” x 14”
  • Weight: 6 lbs
  • Body Materials: Aluminum and stainless steel
  • Safety Features: Overload protection
  • Other Features: Hopper lid, dosing cup, grounds bellow

  • Burr Material: Stainless steel

  • Burr Type: Conical
  • Burr Size: 40mm
  • Adjustable Grind Settings: 95
  • Grinding Speed: 1.5 grams per second
  • Bean Hopper Capacity: 40 grams
  • Grounds Bin Capacity: 100 grams
  • Motor Power: 150 watts
  • Power Requirements: 110-120V, 50/60Hz
  • Dimensions: 6.8” length x 3.8” width x 14” height
  • Net Weight: 6 lbs
  • Housing Material: Aluminum
  • Safety Features: Overload protection
  • Accessories Included: Hopper lid, dosing cup, grounds bellow

What’s Included:

The box contains:
- MiiCoffee D40+ grinder
- Grounds dosing cup
- Grinder cleaning brush
- User manual

MiiCoffee D40+ Single Dose Coffee Grinder User Manual

Unboxing and Setup

  • Carefully unpack the MiiCoffee D40+ grinder from its packaging.
  • Remove any protective films or packaging materials.
  • Place the grinder on a stable, level surface near a power outlet.
  • Ensure the bean hopper and grounds bin are securely attached.


Grinding Process:

  1. Bean Loading: Lift the hopper lid and pour your desired amount of coffee beans into the hopper.
  2. Grind Adjustment: Use the adjustment ring to select your desired grind size. Refer to the grind size chart for guidance.
  3. Dosing: Place the dosing cup under the spout and press the pulse grinding button to start the grinding process. The grinder will automatically stop once the desired dose is reached.
  4. Cleaning: After each use, brush the burrs to remove any leftover grounds or oils. For thorough cleaning, refer to the maintenance section.

Maintenance and Cleaning

  • Daily Cleaning: Wipe the exterior of the grinder with a damp cloth to remove any coffee residue.
  • Weekly Cleaning: Remove the bean hopper and grounds bin to access the burrs. Brush the burrs thoroughly to remove any trapped grounds or oils.
  • Monthly Maintenance: Check the alignment of the burrs and adjust if necessary. Lubricate moving parts as instructed in the maintenance manual.


Problem: Grinder is not turning on.
Solution: Ensure the grinder is properly plugged into a functioning power outlet and the power switch is in the “on” position.

Problem: Uneven grind consistency.
Solution: Adjust the grind size and ensure the burrs are clean and properly aligned.

Problem: Excessive noise during grinding.
Solution: Check for any foreign objects stuck in the burrs or hopper, and ensure all parts are securely assembled.

Warranty Information

Your MiiCoffee D40+ Single Dose Coffee Grinder is covered by a 1-year warranty against defects in materials and workmanship. For warranty claims or inquiries, please contact our customer service team.