Application:The direct drive upgrade kit is suitable for , 3 Pro, 3S. Excellent Extrusion Control: Direct drive extruder improves extrusion and retraction by shortening the feeding distance, it ensures accurate retraction and better printing results. Stable Operation: The holes of the split conversion bracket are perfectly aligned, and there are supports on both sides to keep the center of in the middle, and the structure is more stable. Flexible Filament Support: Compared with remote feeding, this direct drive extrusion can greatly improve the printing quality of TPU and other flexible materials. Easy Installation: No reduction of build platform size, no firmware modification or wiring required. Simply remove the original board from 3 series and install this direct drive upgrade kit style:B Extruder Motor Kit Colour:black Material:plastic Note: Without motor Package Contents: 1 * Printer Accessories kit 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.