Compatibility Our coffee portafilter is suitable for Delonghi EC680 and EC685. The bottomless portafilter 51mm is suitable for SMEG ECF01, TSK1837B, and TSK1819A espresso machines. Please check if it fits your coffee machine before . Materials and design The 51mm portafilter is available in two materials: wood and ABS. The handle is comfortable and stable in the hand. The handle head is made of foodgrade material and is handpolished to a gloss, which is more hygienic and safer. Grinding and extraction guidance Too much, too little, or uneven distribution of coffee powder will cause splashing during extraction. Adjust the grinding coarseness to avoid too fine or too coarse, and then compact the coffee powder with the coffee machine. This problem can be effectively avoided. Cleaning and maintenance The bottomless portafilter 51mm has a detachable design that allows you to clean more thoroughly. There are fewer accumulation points of coffee grounds in the 51mm portafilter, which is easier to rinse and will not leave residue. Use scenarios Scenario 1: Home espresso with Delonghi EC680 or EC685. Use the 51mm portafilter with properly ground and tamped coffee to improve extraction consistency and crema. Scenario 2: Observing shot quality with SMEG ECF01, TSK1837B, or TSK1819A using the bottomless 51mm portafilter to visually identify channeling and adjust grind size accordingly. Scenario 3: Regular cleaning and maintenance in a kitchen or small cafe. The detachable design facilitates thorough cleaning and helps prevent residue buildup.