I've worked with the BOCA flight strip printer (bocasystems.com), which is the printer used in the FAA in the U.S.. It plugs into USB and shows up in Windows as a regular printer. You can print to it from any app, including Word. It treats the strips like a really wide and short piece of paper. Or for special functionality like changing fonts or drawing lines, it has a command set you put in brackets within the string you're printing. I found it very easy to use. It's about $2,500 U.S. though. They also sell strips, and will sell in single quantities.