I've got a Workbee CNC (with GRBL + CNCJS), which I'd like to use to cut some holes in an aluminium bed which will be used in a 3D Printer. I've got a 304x304x8mm cast aluminium bed that is the exact dimensions I need, but I need to get 4 x mount holes aligned right next to either edge of the bed. What would you recommend I do to align this piece correctly? If it's not aligned perfectly to the X/Y axes then I'll end up with holes drilled incorrectly. I was going to manually jog the machine and draw some temporary lines - which will be reasonable accurate. Is there a better way? Can I use an XYZ probe and somehow correct for any workpiece skew?