Terdragons

thingiverse

A compilation of terdragons is introduced. Initially described by Chandler Davis and Donald Knuth in 1970's Journal of Recreational Mathematics, these fractal curves form the basis for broadband antennas, reducing cell phone sizes. The terdragon resembles the dragon curve; it can be generated through stages. OpenSCAD code is partially parametric to create the first seven orders of the terdragon. In place of generating lines, rectangular blocks with chosen dimensions are used. Terdragon STL files exist for degrees 2 to 7. Curves 2-5 share the same scale and use red, 11mm long, 2mm wide, and 4mm high rectangular blocks. Scaled by a factor of 1/3 in x and y, curves 6 and 7 are printed in blue. These models are best printed directly on the build platform with careful removal post-printing for curves 6 and 7. The largest terdragon, degree 7, contains 2187 polyhedra and takes nearly 3 hours to print, weighing at 13 grams. An up-close image of this model is available on the upper left.