Rice Dumpling Tetrahedral Mould

thingiverse

Chinese people eat rice dumplings at this time of the year (5th day of the 5th month of the lunar year) during the Dragon Boat Festival. This mould is to help get the proper shape when placing bamboo leaves to wrap the dumpling. Commercial moulds usually have a flattened point where the tetrahedron meets the base. This one was designed to have a proper sharp point there. There are versions with different bases. The length of each edge of the tetrahedron is approximately 100 mm. That's the size of the dumplings my wife makes for the family, without the help of a mould! To code the tetrahedron, I used William A Adams' suggestion of taking alternate vertices of a cube and connecting them will a Hull function. I have also borrowed from a public domain code contributed by Gael Lafond in 2018 to get more a more efficient coding of tetrahedrons used in the third model where I have added a hexagonal base. Thanks, guys.