Ender 3 pro printed upgrades July 8, 2019 16 32 64 128 Ender 3 s1 pro printed upgrades Ender 3 printed upgrades Ender 3 s1 pro 3d printed upgrades Ender 3 pro 3d printed upgrades Ender 3 upgrades to print Ender 3 s1 upgrade firmware Ender 3 pro print Ender 3 pro speed upgrade Ender 3 pro z axis upgrade