If you own a Barista style Coffee Machine you will appreciate this design. It's made to work with common 54mm coffee grounds holders. The design has a thick upper section to make it withstand solid hits to clear the coffee grounds.
The Knock Box is deep enough to catch a generous double shot and has a diameter allowance to ensure you don't easily miss catching all the waste coffee.
There is also a handle to hold when 'knocking' and clearing the coffee grounds. This is also convenient when emptying the Knock Box.
Printed in earth-friendly PLA filament in color of your choice.
Design credit to muzz64@Thingiverse: https://www.thingiverse.com/thing:1155051