Penrose Chickens

pinshape

Human: Summary Penrose Chickens were designed by mathematician Roger Penrose. They tile aperiodically... i.e., they tessellate, but the pattern never repeats. See https://en.wikipedia.org/wiki/Penrose_tiling\nThis is my own implementation of Penrose Chickens... various examples I found on the Internet don't work :(, so I designed my own version, based on Penrose P2 (kite & dart) tiling. Printer Settings Printer Brand: Printrbot Printer: Simple Black Rafts: No Supports: No Infill: 10% is fine Post-Printing If your printer isn't very accurate, you may need to sand/scrape the edges to make things fit. This seems particularly true around the beaks. How I Designed This This design is based on the kite & dart (P2) tiling system. This project is a Public project at OnShape.com... go there and search for "Penrose Chickens". Feel free to copy it and remix.\nNote that there are only two different line shapes, one long and one short, which are rotated and translated to make up the sides of the kite and dart shapes. By changing these line shapes, you can create other objects with the P2 tessellation property.\nSomeone might like to remix this so the short lines (bottom of the kite bird, top of the dart bird) interlock, making the whole tesselation lock together, just like the beaks fit into their corresponding cutouts.\nI offset the zero-tolerance outline of each object by 0.25mm, allowing for errors in printing. If you have a very accurate printer, you may want to reduce that to make for a tighter fit. Changing the offset by large amounts can cause the decoration lines on the top surface to get messed up.\nThe bottom and top surfaces of both objects are also chamfered or filleted so any excess around the edges of the top or bottom layers won't affect the fit.