Use removable A4988 or DRV8825 compatible stepping driver. The extension board can be used for engraving machine or 3D printer driver. Compatible with GRBL 0.8. Open-source firmware operated on UNO, converting G code command into stepping signal. PWM spindle and direction pin, 4 shaft support (X, Y, Z, A - you can copy X, Y, Z or use pin D12 and D13 customize firmware perform complete shaft 4). Compact design, stepping motor can connect 4 pin connectors or be soldered. This is a set of disassembled part, and you need basic soldering skills to solder them together.
CNC Expansion Board:
Size: 68 x 53 x 18mm / 2.67 x 2.08 x 0.7"
Voltage: DC 12V to 36V (only DRV8825 driver can handle up to 36V, so please consider voltage for power supply)
4pcs A4988 Driver:
Size: 20 x 15mm / 0.78 x 0.59"
Thermal Shutdown Circuit: Yes
Cross Current Protection: Yes
Ground Fault Protection: Yes
Short Circuit Protection: Yes
Compatible Logic Voltage: 3.3V and 5V
Five Step Modes: Full, 1/2, 1/4, 1/8 and 1/16
Mix with slow current attenuation model.
Internal UVLO and low RDS (on) output.
Automatic current attenuation mode Detection/Select.
Phase-in rectifier, low power consumption.
Warning: Connecting or disconnecting stepping motor while driver is powered on might damage driver.
4pcs Heat Sinks:
Size: 8 x 8mm / 0.31 x 0.31"
1 x V3 Extension Board
4 x Drivers
4 x Heat Sinks