3D Printer Accessories Set meets most needs. Including CNC Shield V3.0, R3 Board, A4988 StepStick Stepper Motor Module. The 3D printer stepper motor shield V3 can be used as driver expansion board for engraving machines and 3D printers.It has in total 4 channel slots for A4988 stepper motor driver modules for driving 4 channel of stepper motors. Each channel of stepper motor only needs 2 IO ports, which means 8 IO ports is sufficient to manage 3 stepper motors. This shield can make quick work for managing stepper motors in your project.CNC Shield Board: PWM Spindle and direction pins; 4-Axis support (X, Y, Z , A-Can duplicate X,Y,Z or do a full 4th axis with custom firmware using pins D12 and D13); 2 x End stops for each axis (6 in total); Coolant enable; Uses removable A4988 or DRV8825 compatible stepper drivers; Compact design; Stepper Motors can be connected with 4 pin molex connectors or soldered in place; Please note that this is an unassembled kit and Basic soldering skills are needed.A4988 Stepper Motor Driver: Low RDS (On) Output; Automatic current decay mode detection / selection; Mix with slow current decay modes; Synchronous rectification for low power dissipation; Internal UVLO; Crossover-current protection; 3.3 and 5 V compatible logic supply; Thermal shutdown circuitry; Ground fault protection; Load short-circuit protection; Five selectable step modes: full, 1/2, 1/4, 1/8 and 1/16 R3 Board for :MCU: USB interface: ATmega16U2Operating voltage: 5VDigital I/O pins: 14 (including 6 with PWM capability)Analog input pins: 6I-I/O pin output current: 40mA max3.3V output current: 150mA maxFlash memory: 32kB (0.5kB used by bootloader- included)Static RAM (SRAM): 2kBEEPROM: 1kBClock speed: 16MHzColour: Picture colorMaterial: PCBPackage Contents:1 * RAMPS 1.4 Controller1 * CH340 Board1 * RAMPS LCD 128646 * Endstop Mechanical Limit Switch With Cable5 * A4988 Stepper Motor Driver5 * Heatsink1 * USB Cable1 * Ltype adapter plate2 * FC cableOnly above package content, other products are not included.Note: Light and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.