Naked / Bottomless Portafilter For Vibiemme MachinesNaked (Bottomless) Portafilter Fits Vibiemme Junior & Super A naked portafilter, also known as a bottomless group handle, is a powerful tool for improving your espresso technique and diagnosing extraction issues. Key Benefits: Training ToolClearly see your espresso shot from the bottom, making it easier to identify over or under extraction and adjust your tamping or grind accordingly. More Cup ClearanceThe open bottom design gives extra space under