Hi Non-Twisty Puzzles fans, Pentagram Gears was suggested by Michael Valle (of the Gearify software), when he saw my Fractional Gears. The results is a 2.5x3 gearing ratio, where the pentagram gear would have "two-and-a-half-fold symmetry". Watch the YouTube video. Buy the puzzle at my Shapeways Shop. Read more at the Non-Twisty Puzzles Forum. Check out the photos below. Enjoy! Oskar