If you're a single doser, this bellows upgrade can help you achieve 0.0g to 0.2g retention on every grind*. This flexible part fits in between your machine's stock hopper and stock lid and transforms it into a blower, so you can say goodbye to the usual varying retention of 0.2 - 0.5 grams of coffee.
No warranty-voiding modifications needed
Bellows works even if you prefer to store beans in the hopper (though less effectively)
[Additional Notes]
The bellows will add an additional 7.5cm (3inch) 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.
[*Disclaimer]
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.