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A free software license that requires that all work based on this must also be free software as in freely remixable and sharable by anyone under the same license but may be used commercially.
Roman surface (https://en.wikipedia.org/wiki/Roman_surface).
Materials and methods
Rafts must be used to get the right curvature on the bottom part of the surface. Infill dos not matter, it is a surface just increase shell thickness (>= 1.2mm). Supports: Touching buildplate only suffices.
I've used a simple GNU/Octave script to generate the initial STL and OpenSCAD to rotate it to a good position for printing.
Then added some thickness using Meshlab - http://meshlab.sourceforge.net/ (inflating the original STL file) using the filter Uniform Mesh Resampling and setting on the 'absolute distance' option and specifying a reasonable offset (1% ~ 2%) and a reasonable precision (0.2% ~ 0.5%).
I encourage you to give a go on Meshlab to see how it goes.
The best surface to print is actually printed was 10-roman-2.stl. The version 3 will also print nicely.
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