Introduction - If you have any usage issues, please Google them yourself
GRBL is restricted to relatively large, using ARV written in C language, there is a new version of 0.8C, can be used in a 328P chip (UNO), the other chips can not use, MEGA2560 will not. Disadvantage is the installation problems, need to use WINAVR to generate the hex file, then XLoader upload to UNO. Has the advantages of high efficiency, strong function, can set the acceleration etc..