Penrose Kite and Dart tiles

thingiverse

10cm along the long axis, a Penrose dart and kite tiles (and if you're familiar with the golden ratio, then you'll notice that the short edges measure 6.18034cm precisely). To assemble them correctly, follow these guidelines: join sides of equal length together in such a way that thick and thin arcs intersect perfectly. There are more intricate rules regarding proper arrangement, but you can find those details elsewhere. I've included the FreeCAD file so you can see how this was achieved - it's all about combining and subtracting cylinders or portions thereof. EDIT 2018-01-11: I made the semi-circles on the hollow pieces slightly thicker.