I realize we went through this in the super awesome class a year ago, however I just got my plate marker hooked up and calibrated, I don't remember where the fill options are located.
When you create a Tool Path select the Fill Tool Path, and there you can define what type of fill you want.
I would suggest making different tools with larger D1 numbers like Plate marker .030, Plate marker .060, plate marker .090 as this will change the fill look but also change up the distances between lines. You can do this under MACHINE/TOOL LIBRARY. You are still going to assign the plate marker the TYPE to PLASMA as any other TYPE adds variables that will cause issues in the VMD.