For demo video click here: https://www.youtube.com/watch?v=m1n_CQJiO8A

Features:
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 Arduino 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.

Package Includes:
1 x V3 Extension Board