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GRBL 0.9 compatible (Open source firmware that runs on for Arduino that turns G-code commands into stepper signals).
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).
Jumpers to set the Micro-Stepping for the stepper drivers. (Some drivers like the DRV8825 can do up to 1/32 micro-stepping).
A4988 Stepper Motor Driver Board is a breakout board for Allegro's A4988 DMOS Micro stepping Driver with Translator and Overcurrent Protection; please read the A4988 datasheet carefully before using this product.