The clever use of waste is becoming more and more popular in the present society. Reusing the residue after cooking coffee, especially as a substitute for printer toner, is a very creative environmental issue. One printer that the designer came up with was very cool. The ink used for printing was actually extracted from ground coffee grounds or tea leaves. Whenever you want to print a document, simply pour non-drinking coffee and tea into the ink cartridge (above the machine) and then “manually” move it around to sweep it out. Although it is a bit cumbersome and the quality of the font cannot be guaranteed to be clear, it is one of the very few creative print products that can really be sold from concept to real sale. Maybe in the near future, we can apply this technology in our office. After drinking coffee, we can print it directly; or, when we want to print a document, we will serve a cup of coffee and serve two purposes.
