So you're not designing them to fail, your designing them to last at least X years/uses (but it can last more in theory). In this case, the printers are litera

So you're not designing them to fail, your designing them to last at least X years/uses (but it can last more in theory). In this case, the printers are literally designed to fail. Once you get to an arbitrary number of uses, you can no longer use them, independently of the device state.