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Bellows Upgrade for Rancilio Rocky For Lower Retention

Regular price $26.00 USD
Regular price $26.00 USD Sale price $26.00 USD
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Shipping calculated at checkout.

Achieve an even lower retention on every grind with your Rancilio Rocky with this 3D printed flexible bellows, up to 0.0g* (+/- 0.5g). It fits in between the stock hopper and stock lid and transforms it into a blower, enabling you to push all of those lingering grounds out.

[Design Features]

Simplicity and maximum effectiveness are our design goals, and both are carefully infused in our bellows' design.

  • The bellows complements the grinder's original design
  • Super easy installation takes less than a minute
  • Ultra soft construction for an effortless pumping action
  • No tools necessary for installation
  • No warranty-voiding modifications needed
  • Zero contact between bellows and beans each time you dose



  • Grinding after changing grind size or using darker roasts/oilier beans may increase retention.
  • Achieve the best results with lighter roasted beans and at a consistent grind size setting.
  • Retention varies more right after cleaning the inside of the grinder
  • Finer grinds may result in more retention, and coarser grinds less retention.
  • Does not include the grinder nor the stock hopper

Introvert is not affiliated, associated, authorized, endorsed by, or in any way officially connected with Rancilio, or any of its subsidiaries or its affiliates. The name Rancilio as well as related names, marks, emblems and images are registered trademarks of their respective owners.


TPU (Thermoplastic Polyurethane)


Care Instructions

• Keep bellows away from heat (40+°C / 104+°F) or it may deform permanently
• To clean, wipe the bellows with a damp (cool water) towel
• Do not put in dishwasher

Customer Reviews

Based on 2 reviews
Happy Customer
Works great!

It's a great design/fit for the Rocky and as my fellow reviewer said, it turns your Rocky into a single dose grinder. I would buy again for sure.

Mike Davis
Really cool bellows!

This product is so cool because it turns the Rancillio Rocky into a single dose grinder. The fit is perfect and it works well!
When I saw some of the other grinders offering bellows I felt a bit left out but a concerted search effort found this Introvert product.
Great product!