1. **Name:** CNC Metal Sherpa Mini Extruder 2. **Applicable models:** - VORON - CR-10 - CR10S - CR-10 4S - CR-10 5S - CR-10 MINI - CR-20 - ENDER-2 - ENDER-3 - ENDER-3 PRO - ENDER-3 V2 - Gasherbrum K3. > It will fit almost all FDM 3D printers if you can design the mounting bracket. 3. **Color:** space gray 4. **Processing technology:** CNC 5. **Material:** aviation aluminum 6. **Features** 1) CNC hollowed out full metal shell, high-quality accessories, high precision, good strength, not easy to deform, high temperature resistance 2) Hollow shell bracket design, lightweight design, light weight, less inertia 3) CNC POM gear, reduction gear design, high transmission ratio, to achieve greater extrusion torque 4) High-quality hard steel nano-coated gears, wear-resistant, good precision and long life 5) Moons' 36 motor with 8 teeth, good thermal control ability, low heat generation and large torque 6) There is a Teflon tube metal joint at one end, which can be adapted to more models at a short distance 7. Weight: 137.7g 8. Print model download link: https://www.thingiverse.com/thing:4974509 9. Note: It is necessary to modify the E-axis step value of the extruder, for example: the E-axis step value of Ender3 is 870. - The maximum driving current of the extruder is 1A, and it is recommended to use it at about 0.8A, which will not cause excessive heat. The reason for adjusting the current: to obtain a more suitable torque to prevent the motor from overheating - Marlin firmware modifies the extruder pulse method (8 teeth 36 motor settings) **Method 1:** Modify the extruder pulse by firmware: `#define DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 400, 870 }` **Method 2:** Send G code (can be sent by slicing software command): `M92 E870` `M500` - 10-tooth 36 motor pulse value: 691 - Klipper firmware modifies the rotation_distance value