Coffee grounds printer without electricity

Hello! There was a craftsman Joen Van Joo, who was able to use the coffee grounds as ink.
But the most amazing thing is that this printer can operate without electricity, i.e. You need to pour a little coffee ground into the cartridge and dilute it with water. Next, you need to move it back and forth, and traces will be left.
It is very interesting to see the quality and speed of such printing.

PS This printer is worthy of the title of the most ecological and waste-free gadget.