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Everything You Wanted to Know About Version 3 of the CNC xPRO Controller

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Version 3 of the CNC xPRO controller will be available in Matte Black finish (not shown)

The CNC xPRO is already known as a single board stepper motor driver that runs the open source G-code interpreter GRBL. The CNC xPRO features:

  • 4 stepper connections
  • Full to 1/32 stepping
  • Options for input and feedback include E-Stop/Reset, Feed Hold, Cycle Start, Homing Location (X,Y,Z Limits), and Z-Probing.
  • Spindle Direction and PWM Control output
  • Current limiting adjustments for each axis
  • Heatsinks installed
  • Latest stable version of GRBL installed

CNC xPRO V3 further expands the capabilities of the board and simplifies the users experience. 


  • Redesigned silkscreen (more pictures, less words)
  • New/Improved FTDI serial USB interface
  • Auxiliary PC fan header (12/24VDC depending on supply voltage)
  • 100% Input buffering to include limit switches (prevent false triggers)
  • Motor driver output LEDs
  • Step/Dir breakout pads to add external drivers
  • Beefed up overvoltage/reverse voltage protection
  • Z-probe pin now accessible from screw terminal
  • Default set to mixed decay (easily changed to slow or fast with jumpers)
  • E-stop now tied to hardware and software (disables steppers in addition to software E-stop)
  • Uses the ATmega328PB (new version of the ATmega328, includes more timers, USART, etc)

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Calibrating your CNC machine is critical to machine performance.  We've got some great resources that will show you how to calibrate using MACH3 or GRBL control software.  Also included is the Prusa Calculator (as seen in video) and a Speeds & Feeds guide that will really help optimize your machine's output.

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Turning Trash into Treasure

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Bitten by the CNC DIY Bug

Bitten by the CNC DIY Bug A Short Story by Mary Daly The dog starts barking at the front door. “I’ll be up in a minute” I yell out pushing even harder on my Allen wrench. The bolt finally breaks free sending my knuckles skidding across the V-Slot. Hearing another knock on the front door, I groan. [...]

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A Wide Addition, the C-Beam Machine XLARGE!

OpenBuilds, in conjunction with Resident Builder Moag, are happy to share the newest addition to the CNC Machine lineup - the C-Beam Machine XLarge! Designed with precision and strength in mind, in a sexy double-wide format, the XLarge is capable of milling a variety of material including Aluminum plate (with light cuts). The build manual [...]

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