ZeroHero Rui Mini Portable Electric Coffee Grinder

Professional-Grade Coffee Grinding Anywhere You Go

The zeroHero Rui Mini Portable Electric Grinder redefines on-the-go coffee preparation for coffee enthusiasts and professionals alike. Designed for those who demand precision and consistency from their coffee equipment, this compact electric grinder seamlessly blends portability with the performance of specialty coffee gear. Whether you’re a home barista, a traveling coffee professional, or an outdoor adventurer, the Rui Mini ensures you never compromise on grind quality or flavor clarity—no matter where your journey takes you.

Engineered for Precision, Built for Adventure

This innovative portable electric coffee grinder features a revolutionary collapsible hopper design, making it easy to slip into your backpack or travel kit. The zeroHero Rui Mini delivers consistent particle size for every grind, unlocking maximum sweetness and clarity in every cup. Its compact footprint and lightweight build (just 480g) make it lighter than a standard water bottle—perfect for travel, camping, or daily commutes. Enjoy the freedom of brewing specialty coffee without being tethered to a kitchen outlet, thanks to the powerful rechargeable battery and efficient USB-C charging.

Key Features & Highlights

• Collapsible Hopper Design: Innovative, space-saving design for effortless portability and storage.
• 38mm Stainless Steel Conical Burrs: Proprietary dual-stage grinding mechanism ensures uniform, consistent grounds for every brew method.
• Double-Bearing Stability: Minimizes vibration and maximizes grind uniformity for professional-level results.
• Auto-Stop Motor: Smart sensor technology halts grinding when beans are finished, preventing over-processing and preserving flavor integrity.
• Quiet Operation: Runs at just 68dB, making it ideal for early mornings or shared spaces.
• Rechargeable 800mAh Lithium Battery: Delivers up to 30 grinding sessions per charge, with convenient USB-C fast charging.
• Magnetic Lid: Securely encloses the hopper, preventing spills and keeping your coffee workflow tidy.
• Adjustable Grind Settings: Fine-tune your grind size for espresso, pour-over, AeroPress, or French press with ease.

Materials & Craftsmanship

Every detail of the zeroHero Rui Mini showcases a commitment to purposeful design and durability. The grinder body is crafted from robust, lightweight materials that withstand the rigors of travel and daily use. The precision-engineered 38mm stainless steel burrs are built for longevity and consistent performance, while the magnetic lid and telescopic powder bin add a touch of thoughtful engineering. This is specialty coffee gear made for those who value both function and form in their espresso accessories and barista tools.

How to Use for Optimal Results

• Extend the Powder Bin: Pull out the telescopic powder bin to its full length.
• Add Beans: Fill the hopper with up to 20g of your favorite roasted coffee beans.
• Start Grinding: Press the power button once. The grinder will operate automatically, and the smart sensor will stop the motor when grinding is complete.
• Collect Grounds: The bottom bin catches up to 25g of freshly ground coffee, ready for brewing.
• Adjust Grind Size: Select your preferred grind setting for espresso, pour-over, or other manual brewing equipment.

This grinder is the perfect companion for a wide range of brewing equipment, including espresso machines, AeroPress, V60, French press, and more.

Compact Dimensions & Travel-Ready Design

• Weight: Only 480g—lighter than most water bottles, ideal for travel and outdoor brewing.
• Folded Height: Just 17cm, making it easy to fit in any bag or backpack.
• Bean Hopper Capacity: Holds up to 20g of whole beans.
• Grounds Bin Capacity: Catches up to 25g of ground coffee.

Care Instructions for Long-Lasting Performance

• Do not wash the internal burrs with water. Use a dry brush to gently remove coffee dust from the burrs.
• Wipe the exterior housing with a soft, dry cloth only.
• Store the grinder with the hopper collapsed to protect internal components.
• Charge the battery using the supplied USB-C cable for optimal battery health.

What’s in the Box

• zeroHero Rui Mini Portable Electric Grinder
• USB-C Charging Cable
• Magnetic Lid
• Telescopic Powder Bin
• Quick Start Guide

Product Specification