Banana Bros OTTO Grinder

The Banana Bros OTTO Grinder is an electronic device that automates milling dry herbs and filling pre-rolled cones. Its core feature is SMART Grinding™ technology, which uses AI to adjust milling speed and pressure for a consistent grind. With single-button operation, the OTTO directly funnels material into a cone for a clean, efficient process. A full battery charge provides enough power to prepare 20-30 cones, making it a convenient tool for consistent results.

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Updated on February 8, 2026

The OTTO Grinder by Banana Bros is an electronic device designed to automate the process of milling dry herbs and filling pre-rolled cones. It utilizes proprietary SMART Grinding™ technology, which employs an AI to sense the material’s consistency and adjust its milling action accordingly. This ensures a uniform grind without crushing or powdering the contents. The grinder operates with a single button, combining the milling and filling into one seamless step, delivering a perfectly filled cone with minimal effort. It is designed for users seeking a consistent and convenient way to prepare their herbs.

Intelligent Milling System

The OTTO Grinder features SMART Grinding™ technology, which uses artificial intelligence to analyze the density and texture of the material placed inside. The system then automatically adjusts the speed, direction, and pressure of the milling plates to achieve an even consistency. This spring-loaded mechanism is engineered to mimic the nuances of hand-grinding, ensuring the material is milled to a uniform particle size without being over-processed, preserving the quality of the herb.

Automated Cone Filling

This device integrates grinding and filling into a single, automated function. With the single push of a button, the OTTO mills the herb and funnels it directly into a pre-rolled cone held below. The process is facilitated by an O-Funnel, which creates a seamless, spill-proof connection between the grinding chamber and the cone. This design ensures all material is transferred cleanly and efficiently, filling the cone without mess or waste.

Rechargeable and Portable Design

Powered by a built-in rechargeable lithium-ion battery, the OTTO provides substantial use on a single charge. A full battery can mill and fill between 20 and 30 cones before needing to be recharged. The device uses a standard USB charging cable and reaches a full charge in approximately 45 minutes. Its magnetic connections allow for easy assembly and disassembly, making it convenient for both home use and travel.