Coffee ground knockbox for portafilters / Abklopfbehälter für Siebträger (Espresso)

A two-part tapping station for portafilter machines. The concept is that the outer box is lifted with the bar, the full collecting box remains on the table. Now you can either empty it directly or replace it with a second empty collection box. The separate parts mean that any combination of colors can be used. 
In my design, wooden sticks with a diameter of 14 mm (0.552 inches) were used. This is simply pushed through and can also be exchanged / customized, for example a thin metal tube or a rod with a rubber coating.

Let your creativity run wild!
Remixes are welcome.