I found a great article that talked about calculating kerf by cutting a whole bunch of pieces, but I don’t have illustrator so I couldn’t open the shared file - I wound up just remaking it as an SVG. Hope this is helpful!
Size should be 5.5" by 1.75". I set the width of the lines for the 20 little bits to the smallest size that would actually show up on the GFUI (.004pt). I did not have to adjust for that size though, I think it just went for whatever the smallest cut it could make was.
Basically the math is:
Total remaining space / total number of pieces = kerf for both sides
Final kerf = kerf for both sides / 2