Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2982069.

My wife is an educator for our local school system. She came across this puzzle at a seminar she attended and asked me to make one. So I did. It's based on a PDF (in the files) that I found on the interwebs. The PDF includes instructions on how it's made and a sheet of other shapes to try your hand at.

Spoiler Note: if you don't want to know the solution, check out the attached PDF after you have solved it!

Enjoy.