Mathematically defined rocket ship

This is a demonstration of an open source tool chain to produce an object defined by a formula.

I used the following Octave script to make the stl file:

clf;
[x,y,z] = meshgrid (-2:0.05:2, -2:0.05:2, -2:0.05:2);
kr = -0.5;
v= (x.^2 + y.^2 + ((z - 1.)*0.5).^2).^kr ...
+ ((x - 0.943).^2 + (y).^2 + ((z + 0.333)*0.5).^2).^kr ...
+ ((x + 0.5).^2 + (y - 0.816).^2 + ((z + 0.333)*0.5).^2).^kr ...
+ ((x + 0.5).^2 + (y + 0.816).^2 + ((z + 0.333)*0.5).^2).^kr;
v1=v1*600;
[f1,v1]=isosurface (x, y, z, v, 4.8);
axis equal;
patch("Faces",f1,"Vertices",v1,"facecolor","r");
# from http://iso2mesh.sourceforge.net
# note that 'savestl' rescales the shape
savestl(v1,f1,"blob07_octave.stl");

Note that the file is scaled to be quite small, so I rescaled it in Slic3r to make the 40mm version.