Choose the wall type for your coffee
Sage specifies single-wall baskets for grinding fresh whole beans and dual-wall baskets for pre-ground coffee. Both manuals also place older beans under the dual-wall heading, using the phrase “past the 30 day roast date”.
| Coffee you are using | Bambino UK UG1 G21 | Bambino Plus EU UG8 K25 |
|---|---|---|
| Fresh whole beans, ground for preparation | Single-wall | Single-wall |
| Pre-ground coffee | Dual-wall | Dual-wall |
| Older beans past Sage’s stated 30-day roast-date threshold | Dual-wall | Dual-wall |
Sources for every row: Sage Bambino, basket-selection section and Sage Bambino Plus, basket-selection section, both checked 20 September 2026.
Choose by the coffee you are preparing, not your experience. Sage’s instructions do not make dual-wall a beginner stage you need to graduate from.
What pressure regulation explains
Sage explains the role of dual-wall baskets directly: “These regulate the pressure”. That wording appears in the Bambino basket section and the Plus basket section, checked 20 September 2026.
The same Bambino section explains that grind size affects how quickly water flows through the ground coffee. It describes excessively coarse grounds allowing water through too quickly and excessively fine grounds preventing flow even under pressure. The Plus extraction chart, checked 20 September 2026, gives the corresponding directions: finer for slower extraction, coarser for faster extraction.
Sage describes single-wall as allowing experimentation with grind, dose and tamp, while it assigns a pressure-regulating function to dual-wall and specifies it for pre-ground coffee. That gives a practical basis for the choice: match the basket to the coffee you are preparing.
Sage’s optimisation language is a manufacturer claim, not a guarantee that any grind or dose will work.
Single-wall is not the same as “1 Cup”
Both manuals list single-wall and dual-wall baskets in “1 Cup” and “2 Cup” versions. Wall type and capacity are separate choices.
Sage gives these design ranges for the supplied baskets:
| Basket capacity marking | Manufacturer-stated ground-coffee range |
|---|---|
| 1 Cup | 8–11 g |
| 2 Cup | 16–19 g |
Sources: Bambino filter-basket section and Plus filter-basket section, checked 20 September 2026. Use Sage’s ranges as starting points to adjust from.
Sage describes the larger basket as suitable for two cups or a stronger single cup or mug.
Sage’s advice about changing grind amount and size when you move from a single basket to a double basket is about capacity, not wall type.
Choosing a machine or accessory
If you are choosing between the machines, compare the milk controls. For a tamper or distributor to use with the original portafilter, check the documented accessory fit.
Choose the wall type for the coffee you are using, then the cup capacity and its stated dose range.