The fast print G-code includes much more aggressive acceleration settings, allowing the printer to reach higher speeds quicker and maintain them, contributing to faster printing.

The diamond operator <> lets the while loop iterate over the input file (our G-code) line-by-line. In this example, we just print back the unchanged content of the G-code line.

In fact, when it comes to 3D printing in particular file sizes can get awfully large. Partly to address this, Prusa have proposed a new .bgcode binary G-code format.