Dosing cup with plunger and lid

thingiverse

This is a dosing cup where after you ground your coffee you can release the grounds from the bottom by pulling out the plunger. The container is filled with the desired amount of coffee grounds, and the plunger is used to shake and de-clump the grounds. This helps ensure a consistent, uniform grind for optimal espresso extraction. The plunger also allows the grounds to be dispensed easily and precisely from the bottom into a portafilter basket (54 or 58mm).