No space for a knockbox?
Fed up with loosing the portafilter sieve in the trash or organic waste bin while trying to clean it?

There is a solution!

Modell A, the version that you find in the enclosed pictures is made of Prusament PETG Matte Black with 0.2 mm layers on a Prusa MK4S. It has been tested with my Kenwood portafilter machine.

Modell B should fit for most other portafilter models (but has not been tested).

If you have more space in your kitchen, have a look at my supersilent knockbox