1. Upgrade the short-range extruder, extrude filament and draw back more accurately and with higher ; 2. Increase the pulley to reduce wear and improve stability; 3. Compatible with more Filament: such as TPU flexible filament, it is more convenient to replace the filament; 4. All-metal structure, easy to replace, increase heat dissipation holes; 5. The short-range/long-range extrusion can be switched at any time, which is convenient to disassemble and does not affect the original printer function. treatment: Suitable for: CR10 for -3, for -3 Pro etc 3d printer How to install ? Just tear down the original hotend plate and mount this direct drive kits. You could also refer to the tutorial on with search term[direct drive plate kit on 3] NOTE: the extruder's position is aligned with the hotend,Pneumatic connections can be installed Color: Black & Red Material: Metal Package Contents: 1Set * mounting plates + extruder (without motor) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.