I find the pdf contains both shaded or colored faces (as polygons) and edges (as line segments). So if your CNC can't tell them apart you have that problem. If I put the pdf in my CAD app the two are easily separated by a magic wand sort of selection. Perhaps you can use a go between app. OR If I export a pdf of a wireframe or hidden line view I only have lines. (single lines, not doubled)

@benha said: ....So I was scaling this by using the tape measure tool..... When you do this, you get weird results.... Same here, I went for the "easy" approach, the 'Tape Measure' tool and not the scale tool where you need to input 0.00333....(repeat3). So I couldn't help you out. But both methods don't seem to give the exact same results! The 'Tape Measure' method fails, while the 'Scale' tool still works (except for e few softened edges) Thanks for bringing this up.