Marlin is the most widely used open-source firmware in 3D printing. It powers millions of printers around the world — from the classic Ender-3 to high-end CoreXY machines — and has been maintained by an active community since 2011. If your printer is not running Klipper, it is almost certainly running Marlin. This guide covers Marlin 2.x (current stable: 2.1.2.7) ...
