Finished versions for around 6 euros, print files and more: https://dubios42.wordpress.com/sonic-...

The ‪@Kaffeemacher‬ have introduced the method of "coffee waving" to further improve the espresso after brewing with vibration.
They have investigated coffee waving and are still working on it. The current aim is to use vibration to better mix the various small particles in the coffee, such as fat, water and other particles.
Normally, these smaller particles clump together to form larger ones. Vibrating prevents this and keeps the small particles on a level surface.

-This makes the taste sweeter and creates a velvety mouthfeel.

You can find out more about in their videos (linked below)

Kaffeemacher English video:    • Coffee Waving makes Espresso better! ...  
Kaffeemacher deutschsprachiges Video:    • Kaffee-Innovation: Espresso mit Vibra...  
Kaffemacher, how to with vibration plate (German):    • Espresso Vibration Anleitung: So wird...