Generally speaking, it is OK to use canned air to help clean paper debris from your printer; however you need to be cautious. If you’ve experienced spilled or leaked toner, canned air is the last thing you want to do as toner dust is very, very fine and you’ll only end up creating a larger mess than you began with. Another instance where you don’t want to use canned air, or at least use it very strategically, is inside an inkjet printer. You may end up spraying globules of ink around the inside of your printer, which may take a long time to either dry or disappear from use.
Canned air is most appropriate for impact printers where you can have paper debris build up over time and collect on the rollers. At American Printer Service, Inc., we don’t recommend using canned air inside of a laser printer unless you’re fairly familiar with the model of printer and know where the different components are. There is a small chance that you’ll actually do any damage to the inside of a printer using canned air during a repair but blowing around all that debris, dust, and toner could cause some problems.
If you notice your printer is looking a little worse for wear, the best thing that you can do is call a professional Technician to come out and give it a thorough cleaning.