When using V carve there is a need to set the size of bit that you are going to use, this is even if the correct bit is showing in the set up panel. If you do not click on the correct bit to add to the job the machine will start the job and dig deeper into the job. broke a new bit because of this. Then not being careful sent the Z lift to 100 mm instead of the y to the right. Broke the z limit switch. Replaced it with a spare and now being more careful when pressing buttons.