Rob has mentioned elsewhere, but the easy thing to do is make a MeshCAM job that is the exact size of the wasteboard, Program Zero at a top corner, do a parallel-only finishing with 75% or so stepover, “machine geometry only”, 0 margin, uncheck “Don’t machine top of stock”. When you set down the flat-end cutter on the wasteboard, call it Z .010" or .25mm or how much you want to face the board down. MeshCAM will make a single lawn-mowing pass back and forth across the top of the wasteboard. If you haven’t skimmed enough off, touch off the cutter again and call it Z .010" or whatever again and repeat.
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