M.C. Escher Fish - laser cut

A simple set of tesselated M.C. Escher fish.

The "fishes in frame" file from the original Thing seemed to be the best starting point to make a puzzle. But looking at the original Thing's file, I noticed a lot of double lines.

I cleaned up the file for better/faster cutting. The file I provide worked perfectly : engrave then cut in one session, on one board of 3.6mm plywood using my Glowforge. The kerf gives enough room to slot the pieces easily without too much wiggle once they are in pla