This 54mm bottomless portafilter was designed to work with the Barista Express, Barista Pro, Barista Touch, Bambino Plus, Infuser and Duo-Temp Pro.
Our bottomless portafilters are made from 304 stainless steel, and all natural wood handles.
Bottomless (aka naked) portafilters are an essential tool for identifying and correcting extraction problems that cannot be seen with standard spouted portafilters. Issues such as under- or overdosing, inconsistent or incorrect grind size, uneven tamp pressure, or unevenly distributed grinds, can all cause improper extraction.
One of the most common visible signs that you're experiencing extraction issues is through channeling (or spurting), which cannot be seen with a standard spouted portafilter. Exposing the bottom of your portafilter basket will allow you to witness these extraction issues first hand, providing an opportunity to diagnose and improve the quality of your shots.
PLEASE NOTE: Channeling and spurting can be very messy, but are EXTREMELY common. This is not a defect of the portafilter itself, but instead is your coffee telling you that there's room for improvement in your preparation process (grind size, tamping, distribution, etc.).