1. Is grblShield open source?
Yes. But we are not sure exactly how it's going to be released yet. We are considering the OSHW license, or possibly a Creative Commons variant. The schematic and layout was done in Diptrace, which is free for small projects (just like Eagle). Unfortunately it only runs on Windows, but has a winebottled version for MacOS.
2. Where did grblShield come from?
We've been avidly following grbl for over a year now as we've been working on the TinyG project (and here). TinyG is a fork of grbl that runs on an Atmel xmega as an integrated embedded system. So we took the motor section of the TinyG design and re-worked it into an Arduino shield wired to support grbl 0.6.
3. How can I find out more about grbl?
3a. How do I flash grbl onto my Arduino hardware?
3b. What Gcode commands does grbl support?
Info about grbl is available on the grbl main page.
You can get the grbl code the grbl github, or use the guide in this wiki: Getting grbl
Please note: for now you will want the patched .HEX file that works better with grblshield.
Back to grblShield Home