Portafilter

Detailed Explanation:
The portafilter consists of a handle, a metal filter basket, and a spout. 

It holds finely ground coffee and allows pressurized water to pass through, resulting in a concentrated espresso shot. 

Portafilters come in single, double, and bottomless styles. A bottomless or “naked” portafilter lets you see the extraction directly, helping diagnose channeling issues or uneven tamping. 

Cleanliness is key…espresso oils can build up and affect flavor. Baristas often use a 58mm portafilter, though size may vary depending on your machine.