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I used to make a lot of stuff out of plywood - laser cut or CNC routered. I always thought it was a shame that these designs are never quite universal. That is, if you want a tight fit, each slot needs to be the exact width of the actual plywood it's slotting into. The process was always:
  • design
  • collect materials
  • update design with actual measurements (seldom are the labelled thicknesses of plywood or acrylic accurate)
  • layout tool paths
  • cut
Of course, if you don't mind sanding down the slot afterward, you can leave the dimensions slightly undersized, but I always thought that defeated the point of having CNC precision.