Say farewell to the typical retention issues when single dosing on your Baratza Virtuoso, and welcome precision with every grind*. With this bellows upgrade you can achieve an incredible 0.0g to 0.2g retention on each grind* as well as significantly reduced chance of a clogged grinder. This bellows was the very first to market back in 2021, and has evolved after 3 years of iterations into a silicone version that is superior in flexibility, durability, and air tightness, allowing for a more effective clearing of retention per pump compared to my previous 3D printed version (discontinued August 2024). [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 rather than replacing it and upsetting its visual balance Super easy installation takes less than a minute No tools necessary for installation No warranty-voiding modifications needed Small manual included with assembly instructions and best use tips Bellows works even if you prefer to store beans in the hopper (though less effectively) Odour-free Special surface treatment for reduced attraction to dust Logo is hidden on the inner surface rather than around the outside [Compatibility] This bellows is compatible with: Virtuoso Virtuoso+ And is also compatible with: Encore Sette 30 Sette 270 Sette 270Wi Vario+ Vario W+ Vario Vario W Forte AP Forte BG [Additional Notes] The bellows will add an additional 3.0cm (1 3/16in) to the height of your hopper after installation, but you need additional space above it. Measuring from the top of your lid without the bellows, you need about 9-13cm (3 1/2 ~ 5 1/8in) of clearance space to operate it comfortably. [*Disclaimers] The finest grind range (0-20) may decrease bellows effectiveness due to restricted air flow. Adjust to a coarser range (20+) while pumping bellows to fully clear retention. Grinding after changing grind size or using darker roasts/oilier beans may still cause some retention Achieve the best results with lighter roasted beans and at a consistent grind size setting The coarser you grind, the more likely you'll achieve zero retention The more beans you store in the hopper, the less effective the bellows may be due to restricted airflow Does not include the grinder nor the stock hopper Some Baratza hoppers are slightly thinner, which may cause the bellows to fit loosely around it. In this case, add a little bit of tape around the rim to increase its thickness before installing bellows. INTROVERT is not affiliated, associated, authorized, endorsed by, or in any way officially connected with Baratza, or any of its subsidiaries or its affiliates. The name Baratza as well as related names, marks, emblems and images are registered trademarks of their respective owners.