The new MDD v1.2 is the easiest direct drive conversion available for your Creality Ender-3 or CR-10 3D printer. Fully installed with the factory creality hot end and extruder, it's lighter than most direct drives, and takes just 20-30 minutes to install-- with no firmware changes, no volume loss, and no cutting or splicing required. While compatible with many hot end and extruders, the MDD was engineered to turn your stock components into a powerful direct drive system with no additional hardware needed, making it the simplest direct drive system for your Creality 3D printer. No firmware changes are needed when using stock extruder and hot end, though we recommend starting with a new slicer profile with a retraction of 1.0mm and ooze control (coast, wipe, etc.) turned OFF.