- Also called: naked portafilter
- Availability: Common
A bottomless (or 'naked') portafilter shows the underside of the basket, which lets the barista see exactly how a shot is pouring — even, syrupy, and amber means good extraction; jets and spritzes mean channeling. Because the espresso comes out cleanly without hitting metal spouts, naked shots also tend to look more consistent and produce slightly more crema in the cup. Most Brooklyn specialty bars use them as a default training and quality-check tool.