Quality AssuranceSprite Extruder Pro Upgrade Kit come with a short cable for connecting BL Touch/CR Touch, combine extruder and all metal hotend enables all the Creality Ender-3 series 3D printers for printing flexible filament such as TPU, PLA, PETG and other flexible filaments. (The firmware has been released on Creality official website) Dual Gear Feeding- Powerful & StableThis direct drive extruder adapts double-toothed structure which does not damage filaments, allowing more reliable and stable feeding. The use of gear with 3.5:1 gear ratio which perfectly matches with motor makes extruder force up to 80N. More precise control of feeding withdrawal.