From the Description...
JuicyBoard is the foundation of a modular, open source platform that makes it easy for you to build a custom 3D printer, CNC router, or any other device driven by stepper motors. The idea is simple, unlike other control boards, JuicyBoard is not pre-populated with any drivers, switches, or other functions. Instead, it includes only the components for common, core functions (e.g., microcontroller, USB port, SD card, etc.), so you have control over adding just the necessary functional modules for your application. This modular approach gives the platform a number of advantages over static board designs, as we explain below. There two models of the base board:
- The R1000AX includes fifteen features slots and is 175 mm x 65.5 mm.
- The R1000A is a more compact model that includes ten feature slots and is 125 mm x 65.5 mm.