Femobook ALL Electric Grinders Review┃Our Coffee Shelter

【Amir – A Trusted Coffee Gear Creator with 700K Followers】

Amir is a renowned content creator specializing in coffee gear reviews and unboxing.

With his expertise, authenticity, and engaging style, he helps coffee enthusiasts make informed decisions when choosing their equipment.

His influence is evident through his 700,000 YouTube subscribers and over 250,000 Instagram followers, guiding countless coffee lovers in selecting the perfect brewing equipment.

【Auto-Stop Function, Premium Build, and Durability in a Rechargeable Coffee Grinder】

After thoroughly reviewing the A3, A4, A4Z, and A5 rechargeable coffee grinders, Amir noted that while they differ in burr design, their overall construction shares more than 90% similarity.

These grinders are crafted from aluminum alloy, precision-machined using CNC techniques, resulting in a premium texture and enhanced durability—qualities Amir finds particularly appealing.

Additionally, Femobook’s rechargeable coffee grinders come equipped with three replaceable & rechargeable batteries, ensuring users can swap them out easily if performance declines over time[1]. 

Another standout feature is the automatic stop function—when the grinder detects no coffee beans in the burr chamber, it shuts down automatically. Amir finds this particularly convenient and user-friendly.

Frank

Femobook's Editor

1. The rechargeable grinders use three 18650 10C lithium batteries with a total capacity of 6000mAh.

【Battery Performance Test Across Different Models】

Amir conducted a real-world battery endurance test with the grinders. Based on espresso grind settings[1]:

• A5 can grind approximately 30 shots

• A4 can grind around 32 shots

• A3 can grind about 45 shots

For pour-over grind settings:

• A5 can grind approximately 125 doses

• A4Z can grind around 110 doses

• A4 can grind about 128 doses

• A3 can grind approximately 138 doses

For easy reference, please see the table below:

Frank

Femobook's Editor

1. Actual grinding times may vary depending on bean type, roast level, and grind size.

【Near Zero Retention & Easy-to-Clean Magnetic Design】

One of the key highlights Amir pointed out is the tool-free magnetic assembly design of Femobook’s rechargeable grinders.

Users can fully disassemble the grinder with just their hands—showcasing Femobook’s dedication to user experience. Cleaning is also incredibly simple using the included air blower and dual-sided brush. Amir praised the brush's effectiveness, calling it one of the best he has used[1].

Additionally, since these grinders can be fully disassembled and have near-zero retention, Amir mentioned that the burr chamber only requires a deep cleaning every 2-3 months, while regular maintenance can be done every two weeks. 

Amir also recommends a gentle twisting motion when removing the grind cup rather than pulling it straight off to avoid unnecessary wear on the silicone cushion pad.

Frank

Femobook's Editor

1. For a smoother disassembly experience, we suggests first turning the grind adjustment ring to the coarsest setting before removing it.

【0.008mm Micro-Adjustment for Precise Flavor Control】

Amir noted that all Femobook electric grinders utilize the same grind adjustment mechanism, each step of the adjustment ring moves the inner burr by 0.008mm.

This ultra-fine tuning provides users with a broad adjustment range, allowing them to optimize their extraction time with precision.

Based on Amir’s tests[1]:

• The ideal espresso grind setting falls between 6 to 7

• The optimal pour-over grind setting is between 8 to 9

For espresso, every one-step adjustment can change extraction time by 2 - 6 seconds, a level of precision that Amir believes is incredibly useful for espresso enthusiasts seeking the perfect shot.

Frank

Femobook's Editor

1. Since Femobook grinders offer over 300 grind settings, one full rotation of the adjustment ring equals 100 steps.

So based on Amir’s settings:
- Espresso range: 60 - 70 steps
- Pour-over range: 180 - 190 steps

Users can fine-tune grind settings based on bean type and roast level.

【Burr Set differences across models】

A3: Compact Burrs, Exceptional for Pour-Over

Equipped with a 38mm burr, the A3 grinder’s burr geometry is similar to high-end hand grinders.

While its smaller burr size requires longer grinding time, its pour-over performance is impressive, delivering a clean, crisp, and juicy sweetness. It also produces rich and full-bodied flavors on espresso.

A4: Espresso-Focused, Rich & Smooth

Featuring a 48mm titanium-coated burr, the A4 grinder is designed for espresso lovers. It produces coffee with a deep chocolate and nutty flavor, maintaining clarity without overpowering other notes.

The texture is rich, creamy, and smooth, offering a luxurious espresso experience.

A4Z: Precision Pour-Over Performance

The A4Z is equipped with a 48mm burr developed in collaboration with 1Zpresso, using the same burr geometry as the ZP6 pour-over-focused hand grinder.

It delivers exceptionally clean and crisp flavors on pour-over, similar to a flat burr profile. 

While not ideal for espresso, it is an exceptional grinder for pour-over enthusiasts seeking clean and crisp flavors.

A5: High-Efficiency All-Rounder

Sporting a 53mm burr, the A5 is the largest rechargeable grinder in this lineup. It offers faster grinding times while accommodating both pour-over and espresso.

Amir describes its espresso flavor profile as balancing between A3 and A4, providing a perfect balance of body and clarity.

【A68 Electric Grinder: precision craftsmanship that even coffee enthusiasts shock】

The A68 plug-in electric grinder is equipped with a high-precision 68mm conical burr, designed for an optimal balance between clarity and complexity in espresso.

Even with light roast beans, it extracts a clean and well-defined flavor. Amir praised its exceptional consistency, calling it one of the most stable espresso grinders he has tested!

One of Amir’s key insights was that burr alignment is critical—even the best burr design won’t perform well if misaligned. The A68’s precision design and perfect burr alignment earned high marks in his review.

Like the rechargeable models, the A68 is fully tool-free and features an integrated magnetic brush that simultaneously cleans residual coffee grounds while grinding.

While its power adapter is slightly large, Amir noted that its significantly quieter operation makes it an excellent choice for users.

【Rechargeable vs. Plug-In Electric Grinders – Amir’s Thoughts】

Amir believes rechargeable grinders are ideal for users who need portability and flexibility.

While using RDT (Ross Droplet Technique) before grinding can help reduce static retention, these grinders are an excellent choice for those who travel frequently but want to avoid hand grinding.

Amir was particularly impressed with the A68’s exceptional burr alignment and grinding consistency.

While the machine’s outer coating showed minor wear after high intensive use, its grinding performance remained flawless. He also expressed interest in seeing a flat burr version in the future.

Amir’s Grinder Recommendations:

• A3: Budget-friendly, dual-purpose for both pour-over and espresso, though slower grinding.

• A4: Ideal for espresso lovers who enjoy rich chocolate and nutty flavors.

• A4Z: Perfect for pour-over enthusiasts seeking clean, crisp flavors.

• A5: A versatile option for those wanting both espresso and pour-over with faster grinding.

• A68: A powerhouse grinder for dedicated home baristas wanting precision and high performance.

Note: The content above is excerpted from the YouTube video by《Our Coffee Shelter》.