The grinder that mills and fills while you kick back
Hand-grinding is the one part of the ritual nobody actually enjoys: sticky fingers, an uneven grind, half your flower stuck in the teeth. The OG OTTO from Banana Bros hands that chore to a machine. It's a palm-sized countertop device that mills flower to a consistent, cone-ready texture and packs it straight into a King or Shorty cone. Load it, tap it, and walk away with a filled pre-roll.
What's under the hood
The OTTO's trick is that it adapts. Banana Bros' patented milling system analyzes the material as it works and automatically adjusts the direction, speed and pressure of its milling blades, so dense sticky flower and light dry flower both come out evenly milled instead of pulverized. The grinding surfaces are aerospace-engineered aluminum milling plates.
Once it's milled, the O-Tube X, a magnetic cone-holding attachment, funnels the ground flower into the cone. Standard King and Shorty cones both fit, with a dedicated Shorty adapter base in the kit.
- Function: automatic mill and cone filler in one device
- Milling: patented system that adjusts blade direction, speed and pressure
- Plates: aerospace-engineered aluminum milling plates
- Cone compatibility: standard King and Shorty cones
- Power: rechargeable, micro-USB charging cord included
- In the box: OTTO unit, O-Tube X, cone starter pack, user manual and quick start guide, plus an accessory box with measuring cup, adapter base, Shorty adapter base, fresh seal tube, 4-in-1 tool and snap cap
- List price: $159.99
Who it's for
The OTTO earns its counter space for anyone who rolls more than they smoke out of glass. Daily joint smokers, hosts who need to fill a tray of pre-rolls before friends show up, and anyone who's simply over the grind-and-roll routine. It's also a strong gift for the person who owns every piece of glass but still fights with a paper.
If you're a purist who loves the tactile ritual of rolling by hand, this isn't aimed at you, and that's fine. It's for the crowd that wants a filled cone in the time it takes to find a lighter. Our Banana Bros OTTO review covers the tradeoffs in detail.
How it compares
Plenty of electric grinders just spin a blade and spit chopped flower into a cup; you still have to pack the cone yourself. The OTTO closes that loop, taking you from whole nug to filled cone without a second tool touching the flower. A dispensing grinder like the Tectonic9 Auto Dispensing Grinder handles the grind, and a manual mill like the Flower Mill gives you texture control, but neither fills the cone.
The adaptive milling is the part that matters: it's the difference between a cone packed too tight to pull and one too loose to stay lit. At a $159.99 list price, it replaces a grinder, a rolling tray and the time you'd otherwise spend rolling a session's worth of joints. See where it lands against the rest of the field in our electric grinder rankings.
Availability
Banana Bros currently shows the OG OTTO as sold out on its own store. The brand's lineup also includes the smaller OTTO GO and limited colorways of the original OTTO.
The culture angle
Banana Bros built the OTTO for the moment pre-rolls stopped being the lazy option and became the format. Dispensary shelves are stacked with singles, multipacks, infused cones and designer papers. The joint is having a full renaissance, and the OTTO is the home version of the machines that pack them at scale.
It's the countertop-appliance energy the category was missing: the same "why am I still doing this by hand?" logic that gave us pod coffee and stand mixers, pointed squarely at flower. Keep it next to the grinder you'll stop reaching for, and brush out the milling plates now and then so the grind stays crisp. 21+ only.