Doesn't work for us
We've had the opposite experience. We were on site doing stuff. As we left, the client asked if we'd swap the toners over in their office laser. Which we did. Not long after, we started to get steaming phone calls from the client's main site, complaining that their SQL server had gone off-line. When we asked why they were shouting at us, they told us "it was OK until you fiddled with the printer". We tried to explain that changing toners in a printer was unlikely to crash a SQL server 40 miles away, but they wouldn't have it. It was definitely our fault, and nothing at all to do with the building maintenance crew wandering around their machine room...