Despite the warnings on the Silhouette website, I decided to try running a sheet of shrink film through my Silhouette cutter. The shrink plastic is quite thick and the blade did not cut through. In fact, it probably dulled quite a bit in the attempt. It turned out okay though, because the blade scored the plastic well enough that I did not have much trouble cutting the shape out with a craft knife.
Sorry, no photos next to a ruler, but here are the before and after with my hole punch for perspective.
This also turned out to be a good time to experiment with some Dimensional Magic. I applied it to the surface of the knot and it seemed surprisingly watery, but seemed to still maintain its shape. I put a drop at the corner of the knot and it across the curve as if it were on a track.
But see how milky it started out?
No worries, it definitely dries clear!