Summary My practice of reaction-diffusion model. Calculated pipe pattern with C program, place around coffee cup with OpenSCAD program. Print Settings Printer: Da Vinci 2.0 duoRafts: YesSupports: Yes Notes: If you would like to change reaction-diffusion pattern (various parameters of reaction-diffusion, random seed, resolution, # of iteration), edit "rdpipe.c", compile and run, redirect output to "rdpipe-sub.scad". The algorithm is Gray-Scott model on pipe world (top/bottom closed, left/right sides are continuous). To change design of the coffee cup, change "rdcup2.scad". The outer reaction-diffusion skin does not fit to the coffee cup, so it's not actually a manifold object. I used Microsoft Model Repair service to fix it. Or solidify operation may work. The "rdpipe-sub.scad" is a part of OpenSCAD program, which initializes array v[] with the data. I don't have other skill/software to place matrix onto surface (or zmap), so did this way. Please comment better ways. I don't think supports are essential on some 3D printers.