## Package List | Product Color | Motor Included | Quantity | Product Name | |---------------|----------------|----------|-------------------------------| | Green | Yes | 1 pcs | Green Sherpa with 36 moons motor | | Grey | Yes | 1 pcs | Grey Sherpa with 36 moons motor | | Green | No | 1 pcs | Green Sherpa without motor | | Grey | No | 1 pcs | Grey Sherpa without motor | ## About the Product **1. Name:** CNC Metal Sherpa Mini Extruder V3 The biggest selling point of the upgraded version (the old version will cause blockage due to motor heating when printing TPU materials). The new version is upgraded to PEEK material, which can effectively block the heat generated by the motor and solve the problem of blockage. The upgrade points are as follows: * POM gears are upgraded to PEEK (30% glass fiber) gears. PEEK material has excellent properties such as high temperature resistance, heat insulation, and wear resistance; * Add PEEK inserts; **2. Scope of application** 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. If you can design the mounting bracket, it is suitable for almost all FDM 3D printers. **3. Color:** Space gray, green **4. Processing technology:** CNC **5. Material:** aviation aluminum **6. Features:** * CNC hollow all-metal shell, high-quality accessories, high precision, good strength, not easy to deform, high temperature resistance; * Hollow shell bracket design, lightweight design, light weight, smaller inertia; * CNC PEEK (30% glass fiber) gear, reduction gear design, high transmission ratio, achieve greater extrusion torque, the material has excellent properties such as high temperature resistance, heat insulation, and wear resistance; * Add PEEK (30% glass fiber) inserts, gear feed to isolate the motor heat; * High-quality hard steel nano-coated gears, wear-resistant, good precision, and long life; * Moons' 36 motor with 8 teeth, good thermal control ability, low heat generation and large torque; * There is a Teflon tube metal joint at one end, which can be adapted to more models in close and long distance; * Spur gears with mold steel matching and nano-coating surface treatment process are configured, which has more stable transmission and longer service life; **7. Notes:** The E-axis step value of the extruder needs to be modified, for example: the E-axis step value of Ender3 is 870. * The maximum extruder drive current is 1A, and it is recommended to use it at around 0.8A, which will not cause excessive heat. Reason for adjusting the current: to obtain a more suitable torque and prevent the motor from overheating. * Method for modifying the extruder pulse in marlin firmware (8-tooth 36 motor setting) ### Method 1: Firmware Modification (Marlin) Modify the extruder steps per unit in firmware: ```cpp #define DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 400, 870 } ``` ### Method 2: G-code Commands (via Slicing Software or Terminal) ```gcode M92 E870 ; Set extruder steps to 870 M500 ; Save to EEPROM ``` ### Steps/Pulse Values Reference | Configuration | Value | |------------------------------|-------| | 10-tooth 36 motor pulse value | 691 | ### Klipper Firmware Modify `rotation_distance` value: - Reference for 8-tooth gear: **~27.3** - Reference for 10-tooth gear: **~22** > Adjust the value based on extrusion calibration results. ### Gear Ratios | Gear Teeth | Ratio (Motor:Gear) | |------------|--------------------| | 8-tooth | 50:8 | | 10-tooth | 50:10 |