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Bellows for Fellow Opus

Regular price $35.00 CAD
Regular price $35.00 CAD Sale price $35.00 CAD
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Shipping calculated at checkout.

Achieve a lower retention on every grind* for an easier single dosing experience and cleaner grinder with this bellows upgrade. This 3D printed flexible part fits in between your Fellow Opus hopper and stock lid and transforms it into a blower.

[Design Features]

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

  • The bellows complements the grinder's original design rather than replacing it and upsetting its visual balance
  • Super easy installation takes less than a minute
  • No tools necessary for installation
  • Zero contact between bellows and beans each time you dose


- Fellow Opus


  • 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.
  • Does not include the grinder nor the stock hoppers in the photos

As someone who is trying to live in a more sustainable way, I reuse packaging material from various sources to pack your order. But don't worry, I won't use material that is dirty :)

A note about tracking: For buyers outside of Canada, Canada Post doesn't offer tracking for the "Small Packet - USA/International Air" option. If you would like your package to be tracked, be sure to choose the "Tracked Packet" option.

Introvert is not affiliated, associated, authorized, endorsed by, or in any way officially connected with Fellow, or any of its subsidiaries or its affiliates. The name Fellow 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 3 reviews

Works fine but maybe not enough air volume to push or clear all the grinds out.

Works Great

Purchased for my father in law. He used dark roast beans and the retention was terrible (anywhere between 2-7+ grams). These bellow pretty much eliminated all retention issues (maybe 0.1-0.4 grams). With lighter roast it would be totally gone.
This works much better than hitting the lid or using lid like a bellow. I highly recommend buying if you own a Fellow Opus.


Great for pushing out the rest of the grounds without having to bang the lid!