OKI Microline 3320 vs OKI Microline 5520

Choosing between the OKI ML3320 and the ML5520 is a choice between a legendary entry-level tank and its more powerful big brother. Both are 9-pin dot matrix printers famous for surviving decades in harsh environments, but the ML5520 offers significantly faster print speeds and a higher monthly duty cycle. While the ML3320 is perfect for a small garage or a retail desk with moderate invoice volume, the ML5520 is built to handle the higher demands of a busy warehouse or an industrial back office. The ML5520 also features a more robust tractor feed system and can handle slightly thicker multipart forms with its higher impact force. OKI’s parts are interchangeable and easy to find for both, but the ML5520 provides a much better characters-per-second rate for clearing large print queues. If you only print a few pages a day, the cheaper ML3320 is a sturdy, familiar friend. But for any operation that needs speed and industrial-strength throughput, the OKI ML5520 is the superior investment. The ML5520 wins for its higher speed and capacity.