What firmware is available for the 4 axis board. Would love a 4 axis grbl to add rotary axis.
Sry the 4 axis is not AVR based Controller board . which can not flash GRBL based Firmware
most people who build a rotary axis steal the y axis control off a 2 axis stepper. You dont need the laser to move in 2 axis if the piece is also moving. T2 laser has the ability to use the x or y axis to control a rotary attachment if you know what the circumference of the object you are engraving on is.