Application:The direct drive upgrade kit is suitable for Ender 3 V2,Ender 3 Pro,Ender 3,Voxelab Aquila 3D printers,NOT compatible with Ender 3 Max,Ender 3 Neo,Ender 3 V2 Neo,NOT compatible with TITAN extruder.NOTE:Extruder or hotend are NOT included in the package;For Ender 3 V2 users, you can print the following fan cover(STL:5340394) Outstanding Extrusion Control:A direct drive extruder improves extrusion and retraction by removing the need for the Bowden (PTFE) tube. It provides precise retraction and a better print result.