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Well, I wasn't at all. But now.....eh, I'm pretty much still not worried. Not about the fire part anyway; there is an internal thermal breaker in the printers that should prevent something like a hacker rapidly cycling the printer actually causing a fire. I am much more concerned about the issue of network vulnerability, using the printer's connection as a vehicle to infect individual PCs or worse. However, I can't imagine many business are out there without a firewall, and if the printer is behind a firewall it seems that it should be pretty secure. I guess that if the printer is one that accepts SD cards, it could potentially be vulnurable to malware from that front if it was already on the SD card, but that's a lot of ifs and it would require some pretty specific malware to exploint a printer vulnerability. Plus, as was already mentioned, there is always that power off button to press at the end of the day, which removes a large percentage of the time that there could be exposure.