This is the perfect motion controller for small CNC projects. It runs and supports all the features of the latest version of Grbl firmware. It is designed to be controlled via USB from PC, Mac, Linux, etc. using any standard GCode sender. It also has the added feature of being able to plug into a Raspberry Pi header and use a sender on Raspberry Pi without any external cables.
Note: This kit is for the basic "motherboard" it does not include the stepper drivers or Arduino Nano.
I wanted a low cost CNC controller that works with a Raspberry Pi. A Raspberry Pi is powerful, but it does not have the real time capability needed for CNC. The Arduino Nano on this controller provides that.
The modular design keeps costs down by allowing you to buy the drivers and Nano from high volume retailers. It also allows you to swap the modules into other projects or easily replace broken ones.
All of the Grbl I/O features are brought out to a header connector. Each I/O function also has its own ground pin adjacent to it to make your wiring easier.
Grbl is a 3 axis controller. The controller supports those axes and adds an extra "ganged" driver in case you machine has 2 motors on one axis.
There is a connector for a hobby servo. This is connected to to the Raspberry Pi I/O pin 12. You should only use a small servo because of the limited 5V power that can be provided.
There is a comprehensive blog post the controller here.
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I have been doing DIY Open Source CNC for almost 20 years.