Arduino UNO CNC Shield V3 - 4-Axis GRBL with A4988 Drivers
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Prices updated: 12 Oct 2026
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About this product
The Arduino UNO CNC Shield V3 is an expansion shield that turns an Arduino UNO into a controller for CNC machines and stepper-based robotics. It runs GRBL 0.8c-compatible open-source firmware that converts G-code into stepper signals, and it supports 4 axes with A4988 stepper drivers. It suits projects such as CNC routers, laser cutters and pick-and-place machines.
Specifications
- Compatible board
- Arduino UNO
- Firmware
- GRBL 0.8c compatible
- Axes
- 4 (X, Y, Z, A)
- Stepper drivers
- 4 x A4988
- Limit switch inputs
- 2 per axis (as listed)
- Spindle control
- Enable and direction
Frequently asked questions
Which firmware does the CNC shield use?
It is designed for GRBL 0.8c-compatible firmware, which runs on the Arduino UNO and turns G-code commands into stepper signals. Upload GRBL to the UNO and send G-code from a compatible sender.
How is the fourth axis connected on an Uno?
By default the fourth axis can duplicate X, Y or Z. A full fourth axis requires custom firmware that uses pins D12 and D13, as stated in the listing.
