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Grbl uses the spindle on off for laser control. My last laser engraver was grbl based and in that version of grbl the z endstop pins were mapped to m03 and m05. That may have changed since then but with a quick firmware edit you can map m03 and m05 to any pins you want. Grbl is very nice but as mentioned above there is no support for 3d printing or 4th axis. Two things i plan to do with my mpcnc with marlin and ramps so that’s a deal breaker for me.