We all take our office printers for granted that when we press print, ink will come out (ok, sometimes it won’t… but generally…). What if we were to tell you that with any standard HP printer, you could print out electronic circuits? And we don’t just mean photos of them, either.
By using special “ink” cartridges that have a special metal salt and water solution, your desktop printer could be printing out even the most complex electornic circuit.
What’s more, it is quite environmentally friendly as the solution is 100% water soluble.
Source: Coolest-Gadgets.com