Just wanted to let people know I had some weird behaviour with GRBL-LPC that I don’t get with smoothie on a K40 running via C3D MINI, exactly the same engraving settings and the firmware settings were as similar as possible. Something, I think the power supply sometimes makes a worrying snapping noise, I thought at first this was the tube arcing through the coolant so did a tank change. Same result so switched back to smoothie and no noise. Noise came back when I reflashed GRBL-LPC so 99% sure its firmware related.
I am sticking with smoothie for now as I don’t know the cause of this fault and I’m scared of the very high voltage in these machines