I do like the expanded gcode command set in grbl and I’m seeing some host software with Camera integration which is really cool. What I’d love to see is implementation of G68 and G69 codes to rotate an axis.
Still grbl is tight code made to run on a memory and io limited uno and cnc shield. Wouldn’t it be easier to add the functionality of grbl to marlin firmware? I plan to use my mpcnc with an extruder at some point so i don’t want to give up that ability.