The hardware thermal protections kick in before a fire is started. The possibility of stealing information or flat-out bricking the printer are more likely tha

The hardware thermal protections kick in before a fire is started. The possibility of stealing information or flat-out bricking the printer are more likely than fire. HP claims all new models since 2009 enforce digital signatures. Firmware updates for older printers should be able to add this feature, but I don't see any evidence to suggest they do (or don't). Further, most laser printers are on relatively safe networks, and even if there are infected machines on the network, there are generally a number of other ways to wreak havoc and steal information.