Just flashed my 10 year old printer (duplicator 5) to Marlin. Super easy to copy the old flash and flash anew because it's AVR based. I'm going to add BLTouch for mesh leveling, the aluminum bed is pretty warped and I'm tired of manually adjusting the z offset especially for 100°C hotbed prints. Going to print nylon soon. I don't need a new printer yet, but the extruders are too weak so I'm limited to 40mm/s print travel.